diff --git a/core/core_bind.cpp b/core/core_bind.cpp
index e3dad090917..e5363f9acc8 100644
--- a/core/core_bind.cpp
+++ b/core/core_bind.cpp
@@ -1375,11 +1375,11 @@ Variant ClassDB::instantiate(const StringName &p_class) const {
 	}
 }
 
-bool ClassDB::class_has_signal(StringName p_class, StringName p_signal) const {
+bool ClassDB::class_has_signal(const StringName &p_class, const StringName &p_signal) const {
 	return ::ClassDB::has_signal(p_class, p_signal);
 }
 
-Dictionary ClassDB::class_get_signal(StringName p_class, StringName p_signal) const {
+Dictionary ClassDB::class_get_signal(const StringName &p_class, const StringName &p_signal) const {
 	MethodInfo signal;
 	if (::ClassDB::get_signal(p_class, p_signal, &signal)) {
 		return signal.operator Dictionary();
@@ -1388,7 +1388,7 @@ Dictionary ClassDB::class_get_signal(StringName p_class, StringName p_signal) co
 	}
 }
 
-TypedArray<Dictionary> ClassDB::class_get_signal_list(StringName p_class, bool p_no_inheritance) const {
+TypedArray<Dictionary> ClassDB::class_get_signal_list(const StringName &p_class, bool p_no_inheritance) const {
 	List<MethodInfo> signals;
 	::ClassDB::get_signal_list(p_class, &signals, p_no_inheritance);
 	TypedArray<Dictionary> ret;
@@ -1400,7 +1400,7 @@ TypedArray<Dictionary> ClassDB::class_get_signal_list(StringName p_class, bool p
 	return ret;
 }
 
-TypedArray<Dictionary> ClassDB::class_get_property_list(StringName p_class, bool p_no_inheritance) const {
+TypedArray<Dictionary> ClassDB::class_get_property_list(const StringName &p_class, bool p_no_inheritance) const {
 	List<PropertyInfo> plist;
 	::ClassDB::get_property_list(p_class, &plist, p_no_inheritance);
 	TypedArray<Dictionary> ret;
@@ -1428,11 +1428,11 @@ Error ClassDB::class_set_property(Object *p_object, const StringName &p_property
 	return OK;
 }
 
-bool ClassDB::class_has_method(StringName p_class, StringName p_method, bool p_no_inheritance) const {
+bool ClassDB::class_has_method(const StringName &p_class, const StringName &p_method, bool p_no_inheritance) const {
 	return ::ClassDB::has_method(p_class, p_method, p_no_inheritance);
 }
 
-TypedArray<Dictionary> ClassDB::class_get_method_list(StringName p_class, bool p_no_inheritance) const {
+TypedArray<Dictionary> ClassDB::class_get_method_list(const StringName &p_class, bool p_no_inheritance) const {
 	List<MethodInfo> methods;
 	::ClassDB::get_method_list(p_class, &methods, p_no_inheritance);
 	TypedArray<Dictionary> ret;
@@ -1513,7 +1513,7 @@ StringName ClassDB::class_get_integer_constant_enum(const StringName &p_class, c
 	return ::ClassDB::get_integer_constant_enum(p_class, p_name, p_no_inheritance);
 }
 
-bool ClassDB::is_class_enabled(StringName p_class) const {
+bool ClassDB::is_class_enabled(const StringName &p_class) const {
 	return ::ClassDB::is_class_enabled(p_class);
 }
 
diff --git a/core/core_bind.h b/core/core_bind.h
index a8244cf7c5d..94d95f2ce98 100644
--- a/core/core_bind.h
+++ b/core/core_bind.h
@@ -435,17 +435,17 @@ public:
 	bool can_instantiate(const StringName &p_class) const;
 	Variant instantiate(const StringName &p_class) const;
 
-	bool class_has_signal(StringName p_class, StringName p_signal) const;
-	Dictionary class_get_signal(StringName p_class, StringName p_signal) const;
-	TypedArray<Dictionary> class_get_signal_list(StringName p_class, bool p_no_inheritance = false) const;
+	bool class_has_signal(const StringName &p_class, const StringName &p_signal) const;
+	Dictionary class_get_signal(const StringName &p_class, const StringName &p_signal) const;
+	TypedArray<Dictionary> class_get_signal_list(const StringName &p_class, bool p_no_inheritance = false) const;
 
-	TypedArray<Dictionary> class_get_property_list(StringName p_class, bool p_no_inheritance = false) const;
+	TypedArray<Dictionary> class_get_property_list(const StringName &p_class, bool p_no_inheritance = false) const;
 	Variant class_get_property(Object *p_object, const StringName &p_property) const;
 	Error class_set_property(Object *p_object, const StringName &p_property, const Variant &p_value) const;
 
-	bool class_has_method(StringName p_class, StringName p_method, bool p_no_inheritance = false) const;
+	bool class_has_method(const StringName &p_class, const StringName &p_method, bool p_no_inheritance = false) const;
 
-	TypedArray<Dictionary> class_get_method_list(StringName p_class, bool p_no_inheritance = false) const;
+	TypedArray<Dictionary> class_get_method_list(const StringName &p_class, bool p_no_inheritance = false) const;
 
 	PackedStringArray class_get_integer_constant_list(const StringName &p_class, bool p_no_inheritance = false) const;
 	bool class_has_integer_constant(const StringName &p_class, const StringName &p_name) const;
@@ -456,7 +456,7 @@ public:
 	PackedStringArray class_get_enum_constants(const StringName &p_class, const StringName &p_enum, bool p_no_inheritance = false) const;
 	StringName class_get_integer_constant_enum(const StringName &p_class, const StringName &p_name, bool p_no_inheritance = false) const;
 
-	bool is_class_enabled(StringName p_class) const;
+	bool is_class_enabled(const StringName &p_class) const;
 
 	ClassDB() {}
 	~ClassDB() {}
diff --git a/core/core_constants.cpp b/core/core_constants.cpp
index 2f70fdf2196..3b96fc20c6e 100644
--- a/core/core_constants.cpp
+++ b/core/core_constants.cpp
@@ -845,7 +845,7 @@ bool CoreConstants::is_global_enum(const StringName &p_enum) {
 	return _global_enums.has(p_enum);
 }
 
-void CoreConstants::get_enum_values(StringName p_enum, HashMap<StringName, int64_t> *p_values) {
+void CoreConstants::get_enum_values(const StringName &p_enum, HashMap<StringName, int64_t> *p_values) {
 	ERR_FAIL_NULL_MSG(p_values, "Trying to get enum values with null map.");
 	ERR_FAIL_COND_MSG(!_global_enums.has(p_enum), "Trying to get values of non-existing enum.");
 	for (const _CoreConstant &constant : _global_enums[p_enum]) {
diff --git a/core/core_constants.h b/core/core_constants.h
index 51842490c88..82d626c7495 100644
--- a/core/core_constants.h
+++ b/core/core_constants.h
@@ -45,7 +45,7 @@ public:
 	static bool is_global_constant(const StringName &p_name);
 	static int get_global_constant_index(const StringName &p_name);
 	static bool is_global_enum(const StringName &p_enum);
-	static void get_enum_values(StringName p_enum, HashMap<StringName, int64_t> *p_values);
+	static void get_enum_values(const StringName &p_enum, HashMap<StringName, int64_t> *p_values);
 };
 
 #endif // CORE_CONSTANTS_H
diff --git a/core/extension/gdextension.cpp b/core/extension/gdextension.cpp
index 19ffe96a092..ce01531b5ce 100644
--- a/core/extension/gdextension.cpp
+++ b/core/extension/gdextension.cpp
@@ -666,12 +666,12 @@ void GDExtension::_get_library_path(GDExtensionClassLibraryPtr p_library, GDExte
 
 HashMap<StringName, GDExtensionInterfaceFunctionPtr> GDExtension::gdextension_interface_functions;
 
-void GDExtension::register_interface_function(StringName p_function_name, GDExtensionInterfaceFunctionPtr p_function_pointer) {
+void GDExtension::register_interface_function(const StringName &p_function_name, GDExtensionInterfaceFunctionPtr p_function_pointer) {
 	ERR_FAIL_COND_MSG(gdextension_interface_functions.has(p_function_name), "Attempt to register interface function '" + p_function_name + "', which appears to be already registered.");
 	gdextension_interface_functions.insert(p_function_name, p_function_pointer);
 }
 
-GDExtensionInterfaceFunctionPtr GDExtension::get_interface_function(StringName p_function_name) {
+GDExtensionInterfaceFunctionPtr GDExtension::get_interface_function(const StringName &p_function_name) {
 	GDExtensionInterfaceFunctionPtr *function = gdextension_interface_functions.getptr(p_function_name);
 	ERR_FAIL_NULL_V_MSG(function, nullptr, "Attempt to get non-existent interface function: " + String(p_function_name) + ".");
 	return *function;
diff --git a/core/extension/gdextension.h b/core/extension/gdextension.h
index 0d20b8e50c8..0b39581751a 100644
--- a/core/extension/gdextension.h
+++ b/core/extension/gdextension.h
@@ -154,8 +154,8 @@ public:
 	void initialize_library(InitializationLevel p_level);
 	void deinitialize_library(InitializationLevel p_level);
 
-	static void register_interface_function(StringName p_function_name, GDExtensionInterfaceFunctionPtr p_function_pointer);
-	static GDExtensionInterfaceFunctionPtr get_interface_function(StringName p_function_name);
+	static void register_interface_function(const StringName &p_function_name, GDExtensionInterfaceFunctionPtr p_function_pointer);
+	static GDExtensionInterfaceFunctionPtr get_interface_function(const StringName &p_function_name);
 	static void initialize_gdextensions();
 	static void finalize_gdextensions();
 
diff --git a/core/object/script_language.h b/core/object/script_language.h
index 69da50f0742..66106bf1397 100644
--- a/core/object/script_language.h
+++ b/core/object/script_language.h
@@ -243,7 +243,7 @@ public:
 	virtual void get_doc_comment_delimiters(List<String> *p_delimiters) const = 0;
 	virtual void get_string_delimiters(List<String> *p_delimiters) const = 0;
 	virtual Ref<Script> make_template(const String &p_template, const String &p_class_name, const String &p_base_class_name) const { return Ref<Script>(); }
-	virtual Vector<ScriptTemplate> get_built_in_templates(StringName p_object) { return Vector<ScriptTemplate>(); }
+	virtual Vector<ScriptTemplate> get_built_in_templates(const StringName &p_object) { return Vector<ScriptTemplate>(); }
 	virtual bool is_using_templates() { return false; }
 	virtual bool validate(const String &p_script, const String &p_path = "", List<String> *r_functions = nullptr, List<ScriptError> *r_errors = nullptr, List<Warning> *r_warnings = nullptr, HashSet<int> *r_safe_lines = nullptr) const = 0;
 	virtual String validate_path(const String &p_path) const { return ""; }
diff --git a/core/object/script_language_extension.h b/core/object/script_language_extension.h
index 852b2aebd88..8b016675198 100644
--- a/core/object/script_language_extension.h
+++ b/core/object/script_language_extension.h
@@ -265,7 +265,7 @@ public:
 
 	GDVIRTUAL1RC(TypedArray<Dictionary>, _get_built_in_templates, StringName)
 
-	virtual Vector<ScriptTemplate> get_built_in_templates(StringName p_object) override {
+	virtual Vector<ScriptTemplate> get_built_in_templates(const StringName &p_object) override {
 		TypedArray<Dictionary> ret;
 		GDVIRTUAL_REQUIRED_CALL(_get_built_in_templates, p_object, ret);
 		Vector<ScriptTemplate> stret;
diff --git a/core/variant/variant.h b/core/variant/variant.h
index 296319d4088..602d287f224 100644
--- a/core/variant/variant.h
+++ b/core/variant/variant.h
@@ -781,8 +781,8 @@ public:
 	static Variant get_constant_value(Variant::Type p_type, const StringName &p_value, bool *r_valid = nullptr);
 
 	static void get_enums_for_type(Variant::Type p_type, List<StringName> *p_enums);
-	static void get_enumerations_for_enum(Variant::Type p_type, StringName p_enum_name, List<StringName> *p_enumerations);
-	static int get_enum_value(Variant::Type p_type, StringName p_enum_name, StringName p_enumeration, bool *r_valid = nullptr);
+	static void get_enumerations_for_enum(Variant::Type p_type, const StringName &p_enum_name, List<StringName> *p_enumerations);
+	static int get_enum_value(Variant::Type p_type, const StringName &p_enum_name, const StringName &p_enumeration, bool *r_valid = nullptr);
 
 	typedef String (*ObjectDeConstruct)(const Variant &p_object, void *ud);
 	typedef void (*ObjectConstruct)(const String &p_text, void *ud, Variant &r_value);
diff --git a/core/variant/variant_call.cpp b/core/variant/variant_call.cpp
index 1daad2058e8..03836985f3a 100644
--- a/core/variant/variant_call.cpp
+++ b/core/variant/variant_call.cpp
@@ -1071,14 +1071,14 @@ struct _VariantCall {
 
 	static ConstantData *constant_data;
 
-	static void add_constant(int p_type, StringName p_constant_name, int64_t p_constant_value) {
+	static void add_constant(int p_type, const StringName &p_constant_name, int64_t p_constant_value) {
 		constant_data[p_type].value[p_constant_name] = p_constant_value;
 #ifdef DEBUG_ENABLED
 		constant_data[p_type].value_ordered.push_back(p_constant_name);
 #endif
 	}
 
-	static void add_variant_constant(int p_type, StringName p_constant_name, const Variant &p_constant_value) {
+	static void add_variant_constant(int p_type, const StringName &p_constant_name, const Variant &p_constant_value) {
 		constant_data[p_type].variant_value[p_constant_name] = p_constant_value;
 #ifdef DEBUG_ENABLED
 		constant_data[p_type].variant_value_ordered.push_back(p_constant_name);
@@ -1091,7 +1091,7 @@ struct _VariantCall {
 
 	static EnumData *enum_data;
 
-	static void add_enum_constant(int p_type, StringName p_enum_type_name, StringName p_enumeration_name, int p_enum_value) {
+	static void add_enum_constant(int p_type, const StringName &p_enum_type_name, const StringName &p_enumeration_name, int p_enum_value) {
 		enum_data[p_type].value[p_enum_type_name][p_enumeration_name] = p_enum_value;
 	}
 };
@@ -1504,7 +1504,7 @@ void Variant::get_enums_for_type(Variant::Type p_type, List<StringName> *p_enums
 	}
 }
 
-void Variant::get_enumerations_for_enum(Variant::Type p_type, StringName p_enum_name, List<StringName> *p_enumerations) {
+void Variant::get_enumerations_for_enum(Variant::Type p_type, const StringName &p_enum_name, List<StringName> *p_enumerations) {
 	ERR_FAIL_INDEX(p_type, Variant::VARIANT_MAX);
 
 	_VariantCall::EnumData &enum_data = _VariantCall::enum_data[p_type];
@@ -1516,7 +1516,7 @@ void Variant::get_enumerations_for_enum(Variant::Type p_type, StringName p_enum_
 	}
 }
 
-int Variant::get_enum_value(Variant::Type p_type, StringName p_enum_name, StringName p_enumeration, bool *r_valid) {
+int Variant::get_enum_value(Variant::Type p_type, const StringName &p_enum_name, const StringName &p_enumeration, bool *r_valid) {
 	if (r_valid) {
 		*r_valid = false;
 	}
diff --git a/editor/editor_resource_picker.cpp b/editor/editor_resource_picker.cpp
index ed20e50685d..011cb266219 100644
--- a/editor/editor_resource_picker.cpp
+++ b/editor/editor_resource_picker.cpp
@@ -675,7 +675,7 @@ bool EditorResourcePicker::_is_drop_valid(const Dictionary &p_drag_data) const {
 	return false;
 }
 
-bool EditorResourcePicker::_is_type_valid(const String p_type_name, HashSet<StringName> p_allowed_types) const {
+bool EditorResourcePicker::_is_type_valid(const String p_type_name, const HashSet<StringName> &p_allowed_types) const {
 	for (const StringName &E : p_allowed_types) {
 		String at = E;
 		if (p_type_name == at || ClassDB::is_parent_class(p_type_name, at) || EditorNode::get_editor_data().script_class_is_parent(p_type_name, at)) {
diff --git a/editor/editor_resource_picker.h b/editor/editor_resource_picker.h
index 35703bcbeb6..fb54455e893 100644
--- a/editor/editor_resource_picker.h
+++ b/editor/editor_resource_picker.h
@@ -99,7 +99,7 @@ class EditorResourcePicker : public HBoxContainer {
 	String _get_resource_type(const Ref<Resource> &p_resource) const;
 	void _get_allowed_types(bool p_with_convert, HashSet<StringName> *p_vector) const;
 	bool _is_drop_valid(const Dictionary &p_drag_data) const;
-	bool _is_type_valid(const String p_type_name, HashSet<StringName> p_allowed_types) const;
+	bool _is_type_valid(const String p_type_name, const HashSet<StringName> &p_allowed_types) const;
 
 	Variant get_drag_data_fw(const Point2 &p_point, Control *p_from);
 	bool can_drop_data_fw(const Point2 &p_point, const Variant &p_data, Control *p_from) const;
diff --git a/editor/export/project_export.cpp b/editor/export/project_export.cpp
index 5d84e4f78f3..b22f70b0fa7 100644
--- a/editor/export/project_export.cpp
+++ b/editor/export/project_export.cpp
@@ -1284,7 +1284,7 @@ ProjectExportDialog::ProjectExportDialog() {
 		ClassDB::get_inheriters_from_class("Resource", &resource_names);
 
 		PackedStringArray strippable;
-		for (StringName resource_name : resource_names) {
+		for (const StringName &resource_name : resource_names) {
 			if (ClassDB::has_method(resource_name, "create_placeholder", true)) {
 				strippable.push_back(resource_name);
 			}
diff --git a/editor/import/3d/post_import_plugin_skeleton_renamer.cpp b/editor/import/3d/post_import_plugin_skeleton_renamer.cpp
index 6ce6aca896a..ffe75f189cf 100644
--- a/editor/import/3d/post_import_plugin_skeleton_renamer.cpp
+++ b/editor/import/3d/post_import_plugin_skeleton_renamer.cpp
@@ -45,7 +45,7 @@ void PostImportPluginSkeletonRenamer::get_internal_import_options(InternalImport
 	}
 }
 
-void PostImportPluginSkeletonRenamer::_internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, HashMap<String, String> p_rename_map) {
+void PostImportPluginSkeletonRenamer::_internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, const HashMap<String, String> &p_rename_map) {
 	// Prepare objects.
 	Object *map = p_options["retarget/bone_map"].get_validated_object();
 	if (!map || !bool(p_options["retarget/bone_renamer/rename_bones"])) {
@@ -121,7 +121,7 @@ void PostImportPluginSkeletonRenamer::_internal_process(InternalImportCategory p
 	// Rename bones in all Nodes by calling method.
 	{
 		Dictionary rename_map_dict;
-		for (HashMap<String, String>::Iterator E = p_rename_map.begin(); E; ++E) {
+		for (HashMap<String, String>::ConstIterator E = p_rename_map.begin(); E; ++E) {
 			rename_map_dict[E->key] = E->value;
 		}
 
diff --git a/editor/import/3d/post_import_plugin_skeleton_renamer.h b/editor/import/3d/post_import_plugin_skeleton_renamer.h
index 98f778f6c2a..a9771173740 100644
--- a/editor/import/3d/post_import_plugin_skeleton_renamer.h
+++ b/editor/import/3d/post_import_plugin_skeleton_renamer.h
@@ -40,7 +40,7 @@ public:
 	virtual void get_internal_import_options(InternalImportCategory p_category, List<ResourceImporter::ImportOption> *r_options) override;
 	virtual void internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options) override;
 
-	void _internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, HashMap<String, String> p_rename_map);
+	void _internal_process(InternalImportCategory p_category, Node *p_base_scene, Node *p_node, Ref<Resource> p_resource, const Dictionary &p_options, const HashMap<String, String> &p_rename_map);
 
 	PostImportPluginSkeletonRenamer();
 };
diff --git a/editor/plugins/bone_map_editor_plugin.cpp b/editor/plugins/bone_map_editor_plugin.cpp
index 72a53088dca..153f1928389 100644
--- a/editor/plugins/bone_map_editor_plugin.cpp
+++ b/editor/plugins/bone_map_editor_plugin.cpp
@@ -95,7 +95,7 @@ void BoneMapperButton::_notification(int p_what) {
 	}
 }
 
-BoneMapperButton::BoneMapperButton(const StringName p_profile_bone_name, bool p_require, bool p_selected) {
+BoneMapperButton::BoneMapperButton(const StringName &p_profile_bone_name, bool p_require, bool p_selected) {
 	profile_bone_name = p_profile_bone_name;
 	require = p_require;
 	selected = p_selected;
diff --git a/editor/plugins/bone_map_editor_plugin.h b/editor/plugins/bone_map_editor_plugin.h
index 9ff32707c75..9479ed3730a 100644
--- a/editor/plugins/bone_map_editor_plugin.h
+++ b/editor/plugins/bone_map_editor_plugin.h
@@ -78,7 +78,7 @@ public:
 
 	bool is_require() const;
 
-	BoneMapperButton(const StringName p_profile_bone_name, bool p_require, bool p_selected);
+	BoneMapperButton(const StringName &p_profile_bone_name, bool p_require, bool p_selected);
 	~BoneMapperButton();
 };
 
diff --git a/editor/plugins/canvas_item_editor_plugin.cpp b/editor/plugins/canvas_item_editor_plugin.cpp
index 7d4502b69de..8dbf67a37a5 100644
--- a/editor/plugins/canvas_item_editor_plugin.cpp
+++ b/editor/plugins/canvas_item_editor_plugin.cpp
@@ -345,7 +345,7 @@ void CanvasItemEditor::_snap_other_nodes(
 	}
 }
 
-Point2 CanvasItemEditor::snap_point(Point2 p_target, unsigned int p_modes, unsigned int p_forced_modes, const CanvasItem *p_self_canvas_item, List<CanvasItem *> p_other_nodes_exceptions) {
+Point2 CanvasItemEditor::snap_point(Point2 p_target, unsigned int p_modes, unsigned int p_forced_modes, const CanvasItem *p_self_canvas_item, const List<CanvasItem *> &p_other_nodes_exceptions) {
 	snap_target[0] = SNAP_TARGET_NONE;
 	snap_target[1] = SNAP_TARGET_NONE;
 
@@ -535,7 +535,7 @@ void CanvasItemEditor::_keying_changed() {
 	}
 }
 
-Rect2 CanvasItemEditor::_get_encompassing_rect_from_list(List<CanvasItem *> p_list) {
+Rect2 CanvasItemEditor::_get_encompassing_rect_from_list(const List<CanvasItem *> &p_list) {
 	ERR_FAIL_COND_V(p_list.is_empty(), Rect2());
 
 	// Handles the first element
@@ -830,7 +830,7 @@ Vector2 CanvasItemEditor::_position_to_anchor(const Control *p_control, Vector2
 	return output;
 }
 
-void CanvasItemEditor::_save_canvas_item_state(List<CanvasItem *> p_canvas_items, bool save_bones) {
+void CanvasItemEditor::_save_canvas_item_state(const List<CanvasItem *> &p_canvas_items, bool save_bones) {
 	original_transform = Transform2D();
 	bool transform_stored = false;
 
@@ -853,14 +853,14 @@ void CanvasItemEditor::_save_canvas_item_state(List<CanvasItem *> p_canvas_items
 	}
 }
 
-void CanvasItemEditor::_restore_canvas_item_state(List<CanvasItem *> p_canvas_items, bool restore_bones) {
+void CanvasItemEditor::_restore_canvas_item_state(const List<CanvasItem *> &p_canvas_items, bool restore_bones) {
 	for (CanvasItem *ci : drag_selection) {
 		CanvasItemEditorSelectedItem *se = editor_selection->get_node_editor_data<CanvasItemEditorSelectedItem>(ci);
 		ci->_edit_set_state(se->undo_state);
 	}
 }
 
-void CanvasItemEditor::_commit_canvas_item_state(List<CanvasItem *> p_canvas_items, String action_name, bool commit_bones) {
+void CanvasItemEditor::_commit_canvas_item_state(const List<CanvasItem *> &p_canvas_items, String action_name, bool commit_bones) {
 	List<CanvasItem *> modified_canvas_items;
 	for (CanvasItem *ci : p_canvas_items) {
 		Dictionary old_state = editor_selection->get_node_editor_data<CanvasItemEditorSelectedItem>(ci)->undo_state;
diff --git a/editor/plugins/canvas_item_editor_plugin.h b/editor/plugins/canvas_item_editor_plugin.h
index 19393263218..7fe63e62820 100644
--- a/editor/plugins/canvas_item_editor_plugin.h
+++ b/editor/plugins/canvas_item_editor_plugin.h
@@ -393,9 +393,9 @@ private:
 
 	CanvasItem *ref_item = nullptr;
 
-	void _save_canvas_item_state(List<CanvasItem *> p_canvas_items, bool save_bones = false);
-	void _restore_canvas_item_state(List<CanvasItem *> p_canvas_items, bool restore_bones = false);
-	void _commit_canvas_item_state(List<CanvasItem *> p_canvas_items, String action_name, bool commit_bones = false);
+	void _save_canvas_item_state(const List<CanvasItem *> &p_canvas_items, bool save_bones = false);
+	void _restore_canvas_item_state(const List<CanvasItem *> &p_canvas_items, bool restore_bones = false);
+	void _commit_canvas_item_state(const List<CanvasItem *> &p_canvas_items, String action_name, bool commit_bones = false);
 
 	Vector2 _anchor_to_position(const Control *p_control, Vector2 anchor);
 	Vector2 _position_to_anchor(const Control *p_control, Vector2 position);
@@ -429,7 +429,7 @@ private:
 	void _switch_theme_preview(int p_mode);
 
 	List<CanvasItem *> _get_edited_canvas_items(bool retrieve_locked = false, bool remove_canvas_item_if_parent_in_selection = true) const;
-	Rect2 _get_encompassing_rect_from_list(List<CanvasItem *> p_list);
+	Rect2 _get_encompassing_rect_from_list(const List<CanvasItem *> &p_list);
 	void _expand_encompassing_rect_using_children(Rect2 &r_rect, const Node *p_node, bool &r_first, const Transform2D &p_parent_xform = Transform2D(), const Transform2D &p_canvas_xform = Transform2D(), bool include_locked_nodes = true);
 	Rect2 _get_encompassing_rect(const Node *p_node);
 
@@ -545,7 +545,7 @@ public:
 		SNAP_DEFAULT = SNAP_GRID | SNAP_GUIDES | SNAP_PIXEL,
 	};
 
-	Point2 snap_point(Point2 p_target, unsigned int p_modes = SNAP_DEFAULT, unsigned int p_forced_modes = 0, const CanvasItem *p_self_canvas_item = nullptr, List<CanvasItem *> p_other_nodes_exceptions = List<CanvasItem *>());
+	Point2 snap_point(Point2 p_target, unsigned int p_modes = SNAP_DEFAULT, unsigned int p_forced_modes = 0, const CanvasItem *p_self_canvas_item = nullptr, const List<CanvasItem *> &p_other_nodes_exceptions = List<CanvasItem *>());
 	real_t snap_angle(real_t p_target, real_t p_start = 0) const;
 
 	Transform2D get_canvas_transform() const { return transform; }
diff --git a/editor/plugins/theme_editor_plugin.cpp b/editor/plugins/theme_editor_plugin.cpp
index bd66e5e9b73..cbe0f115d32 100644
--- a/editor/plugins/theme_editor_plugin.cpp
+++ b/editor/plugins/theme_editor_plugin.cpp
@@ -2374,7 +2374,7 @@ void ThemeTypeEditor::_update_type_list_debounced() {
 	update_debounce_timer->start();
 }
 
-HashMap<StringName, bool> ThemeTypeEditor::_get_type_items(String p_type_name, void (Theme::*get_list_func)(StringName, List<StringName> *) const, bool include_default) {
+HashMap<StringName, bool> ThemeTypeEditor::_get_type_items(String p_type_name, void (Theme::*get_list_func)(const StringName &, List<StringName> *) const, bool include_default) {
 	HashMap<StringName, bool> items;
 	List<StringName> names;
 
diff --git a/editor/plugins/theme_editor_plugin.h b/editor/plugins/theme_editor_plugin.h
index cf8c5ceb28d..8ad262da557 100644
--- a/editor/plugins/theme_editor_plugin.h
+++ b/editor/plugins/theme_editor_plugin.h
@@ -373,7 +373,7 @@ class ThemeTypeEditor : public MarginContainer {
 	VBoxContainer *_create_item_list(Theme::DataType p_data_type);
 	void _update_type_list();
 	void _update_type_list_debounced();
-	HashMap<StringName, bool> _get_type_items(String p_type_name, void (Theme::*get_list_func)(StringName, List<StringName> *) const, bool include_default);
+	HashMap<StringName, bool> _get_type_items(String p_type_name, void (Theme::*get_list_func)(const StringName &, List<StringName> *) const, bool include_default);
 	HBoxContainer *_create_property_control(Theme::DataType p_data_type, String p_item_name, bool p_editable);
 	void _add_focusable(Control *p_control);
 	void _update_type_items();
diff --git a/editor/plugins/tiles/tile_data_editors.cpp b/editor/plugins/tiles/tile_data_editors.cpp
index 221833d4502..dcf9a5e8fa9 100644
--- a/editor/plugins/tiles/tile_data_editors.cpp
+++ b/editor/plugins/tiles/tile_data_editors.cpp
@@ -112,16 +112,16 @@ bool DummyObject::_get(const StringName &p_name, Variant &r_ret) const {
 	return false;
 }
 
-bool DummyObject::has_dummy_property(StringName p_name) {
+bool DummyObject::has_dummy_property(const StringName &p_name) {
 	return properties.has(p_name);
 }
 
-void DummyObject::add_dummy_property(StringName p_name) {
+void DummyObject::add_dummy_property(const StringName &p_name) {
 	ERR_FAIL_COND(properties.has(p_name));
 	properties[p_name] = Variant();
 }
 
-void DummyObject::remove_dummy_property(StringName p_name) {
+void DummyObject::remove_dummy_property(const StringName &p_name) {
 	ERR_FAIL_COND(!properties.has(p_name));
 	properties.erase(p_name);
 }
@@ -948,7 +948,7 @@ GenericTilePolygonEditor::GenericTilePolygonEditor() {
 	_set_snap_option(EditorSettings::get_singleton()->get_project_metadata("editor_metadata", "tile_snap_option", SNAP_NONE));
 }
 
-void TileDataDefaultEditor::_property_value_changed(StringName p_property, Variant p_value, StringName p_field) {
+void TileDataDefaultEditor::_property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field) {
 	ERR_FAIL_NULL(dummy_object);
 	dummy_object->set(p_property, p_value);
 	emit_signal(SNAME("needs_redraw"));
@@ -981,7 +981,7 @@ Variant TileDataDefaultEditor::_get_value(TileSetAtlasSource *p_tile_set_atlas_s
 	return tile_data->get(property);
 }
 
-void TileDataDefaultEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) {
+void TileDataDefaultEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) {
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	for (const KeyValue<TileMapCell, Variant> &E : p_previous_values) {
 		Vector2i coords = E.key.get_atlas_coords();
@@ -1455,7 +1455,7 @@ Variant TileDataOcclusionShapeEditor::_get_value(TileSetAtlasSource *p_tile_set_
 	return tile_data->get_occluder(occlusion_layer);
 }
 
-void TileDataOcclusionShapeEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) {
+void TileDataOcclusionShapeEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) {
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	for (const KeyValue<TileMapCell, Variant> &E : p_previous_values) {
 		Vector2i coords = E.key.get_atlas_coords();
@@ -1481,11 +1481,11 @@ TileDataOcclusionShapeEditor::TileDataOcclusionShapeEditor() {
 	add_child(polygon_editor);
 }
 
-void TileDataCollisionEditor::_property_value_changed(StringName p_property, Variant p_value, StringName p_field) {
+void TileDataCollisionEditor::_property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field) {
 	dummy_object->set(p_property, p_value);
 }
 
-void TileDataCollisionEditor::_property_selected(StringName p_path, int p_focusable) {
+void TileDataCollisionEditor::_property_selected(const StringName &p_path, int p_focusable) {
 	// Deselect all other properties
 	for (KeyValue<StringName, EditorProperty *> &editor : property_editors) {
 		if (editor.key != p_path) {
@@ -1634,10 +1634,10 @@ Variant TileDataCollisionEditor::_get_value(TileSetAtlasSource *p_tile_set_atlas
 	return dict;
 }
 
-void TileDataCollisionEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) {
+void TileDataCollisionEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) {
 	Dictionary new_dict = p_new_value;
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
-	for (KeyValue<TileMapCell, Variant> &E : p_previous_values) {
+	for (const KeyValue<TileMapCell, Variant> &E : p_previous_values) {
 		Vector2i coords = E.key.get_atlas_coords();
 
 		Dictionary old_dict = E.value;
@@ -1802,7 +1802,7 @@ void TileDataTerrainsEditor::_update_terrain_selector() {
 	}
 }
 
-void TileDataTerrainsEditor::_property_value_changed(StringName p_property, Variant p_value, StringName p_field) {
+void TileDataTerrainsEditor::_property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field) {
 	Variant old_value = dummy_object->get(p_property);
 	dummy_object->set(p_property, p_value);
 	if (p_property == "terrain_set") {
@@ -2871,7 +2871,7 @@ Variant TileDataNavigationEditor::_get_value(TileSetAtlasSource *p_tile_set_atla
 	return tile_data->get_navigation_polygon(navigation_layer);
 }
 
-void TileDataNavigationEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) {
+void TileDataNavigationEditor::_setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) {
 	EditorUndoRedoManager *undo_redo = EditorUndoRedoManager::get_singleton();
 	for (const KeyValue<TileMapCell, Variant> &E : p_previous_values) {
 		Vector2i coords = E.key.get_atlas_coords();
diff --git a/editor/plugins/tiles/tile_data_editors.h b/editor/plugins/tiles/tile_data_editors.h
index 4bba5bb4673..27fe4316a05 100644
--- a/editor/plugins/tiles/tile_data_editors.h
+++ b/editor/plugins/tiles/tile_data_editors.h
@@ -82,9 +82,9 @@ protected:
 	bool _get(const StringName &p_name, Variant &r_ret) const;
 
 public:
-	bool has_dummy_property(StringName p_name);
-	void add_dummy_property(StringName p_name);
-	void remove_dummy_property(StringName p_name);
+	bool has_dummy_property(const StringName &p_name);
+	void add_dummy_property(const StringName &p_name);
+	void remove_dummy_property(const StringName &p_name);
 	void clear_dummy_properties();
 };
 
@@ -224,7 +224,7 @@ private:
 	HashMap<TileMapCell, Variant, TileMapCell> drag_modified;
 	Variant drag_painted_value;
 
-	void _property_value_changed(StringName p_property, Variant p_value, StringName p_field);
+	void _property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field);
 
 protected:
 	DummyObject *dummy_object = memnew(DummyObject);
@@ -238,7 +238,7 @@ protected:
 	virtual void _set_painted_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile);
 	virtual void _set_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile, Variant p_value);
 	virtual Variant _get_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile);
-	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value);
+	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value);
 
 public:
 	virtual Control *get_toolbar() override { return toolbar; };
@@ -291,7 +291,7 @@ private:
 	virtual void _set_painted_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
 	virtual void _set_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile, Variant p_value) override;
 	virtual Variant _get_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
-	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) override;
+	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) override;
 
 protected:
 	virtual void _tile_set_changed() override;
@@ -316,15 +316,15 @@ class TileDataCollisionEditor : public TileDataDefaultEditor {
 	DummyObject *dummy_object = memnew(DummyObject);
 	HashMap<StringName, EditorProperty *> property_editors;
 
-	void _property_value_changed(StringName p_property, Variant p_value, StringName p_field);
-	void _property_selected(StringName p_path, int p_focusable);
+	void _property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field);
+	void _property_selected(const StringName &p_path, int p_focusable);
 	void _polygons_changed();
 
 	virtual Variant _get_painted_value() override;
 	virtual void _set_painted_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
 	virtual void _set_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile, Variant p_value) override;
 	virtual Variant _get_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
-	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) override;
+	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) override;
 
 protected:
 	virtual void _tile_set_changed() override;
@@ -368,7 +368,7 @@ private:
 	EditorPropertyEnum *terrain_set_property_editor = nullptr;
 	EditorPropertyEnum *terrain_property_editor = nullptr;
 
-	void _property_value_changed(StringName p_property, Variant p_value, StringName p_field);
+	void _property_value_changed(const StringName &p_property, Variant p_value, const StringName &p_field);
 
 	void _update_terrain_selector();
 
@@ -405,7 +405,7 @@ private:
 	virtual void _set_painted_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
 	virtual void _set_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile, Variant p_value) override;
 	virtual Variant _get_value(TileSetAtlasSource *p_tile_set_atlas_source, Vector2 p_coords, int p_alternative_tile) override;
-	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, HashMap<TileMapCell, Variant, TileMapCell> p_previous_values, Variant p_new_value) override;
+	virtual void _setup_undo_redo_action(TileSetAtlasSource *p_tile_set_atlas_source, const HashMap<TileMapCell, Variant, TileMapCell> &p_previous_values, Variant p_new_value) override;
 
 protected:
 	virtual void _tile_set_changed() override;
diff --git a/editor/plugins/tiles/tile_set_atlas_source_editor.cpp b/editor/plugins/tiles/tile_set_atlas_source_editor.cpp
index a3fc6aa5f7e..895df177efd 100644
--- a/editor/plugins/tiles/tile_set_atlas_source_editor.cpp
+++ b/editor/plugins/tiles/tile_set_atlas_source_editor.cpp
@@ -507,7 +507,7 @@ void TileSetAtlasSourceEditor::AtlasTileProxyObject::_get_property_list(List<Pro
 	}
 }
 
-void TileSetAtlasSourceEditor::AtlasTileProxyObject::edit(Ref<TileSetAtlasSource> p_tile_set_atlas_source, RBSet<TileSelection> p_tiles) {
+void TileSetAtlasSourceEditor::AtlasTileProxyObject::edit(Ref<TileSetAtlasSource> p_tile_set_atlas_source, const RBSet<TileSelection> &p_tiles) {
 	ERR_FAIL_COND(!p_tile_set_atlas_source.is_valid());
 	ERR_FAIL_COND(p_tiles.is_empty());
 	for (const TileSelection &E : p_tiles) {
diff --git a/editor/plugins/tiles/tile_set_atlas_source_editor.h b/editor/plugins/tiles/tile_set_atlas_source_editor.h
index 7f6bab804d8..e1e6a3113c6 100644
--- a/editor/plugins/tiles/tile_set_atlas_source_editor.h
+++ b/editor/plugins/tiles/tile_set_atlas_source_editor.h
@@ -105,7 +105,7 @@ public:
 		RBSet<TileSelection> get_edited_tiles() const { return tiles; };
 
 		// Update the proxyed object.
-		void edit(Ref<TileSetAtlasSource> p_tile_set_atlas_source, RBSet<TileSelection> p_tiles = RBSet<TileSelection>());
+		void edit(Ref<TileSetAtlasSource> p_tile_set_atlas_source, const RBSet<TileSelection> &p_tiles = RBSet<TileSelection>());
 
 		AtlasTileProxyObject(TileSetAtlasSourceEditor *p_tiles_set_atlas_source_editor) {
 			tiles_set_atlas_source_editor = p_tiles_set_atlas_source_editor;
diff --git a/editor/scene_tree_dock.cpp b/editor/scene_tree_dock.cpp
index 3ea96a66cd0..4a5358e435f 100644
--- a/editor/scene_tree_dock.cpp
+++ b/editor/scene_tree_dock.cpp
@@ -1243,7 +1243,7 @@ void SceneTreeDock::_tool_selected(int p_tool, bool p_confirm_override) {
 				if (cant_be_set_unique_names.size()) {
 					String popup_text = TTR("Unique names already used by another node in the scene:");
 					popup_text += "\n";
-					for (StringName name : cant_be_set_unique_names) {
+					for (const StringName &name : cant_be_set_unique_names) {
 						popup_text += "\n" + String(name);
 					}
 					accept->set_text(popup_text);
diff --git a/modules/gdscript/gdscript.h b/modules/gdscript/gdscript.h
index 3ff8f757cf5..7b0e2136ed2 100644
--- a/modules/gdscript/gdscript.h
+++ b/modules/gdscript/gdscript.h
@@ -540,7 +540,7 @@ public:
 	virtual void get_string_delimiters(List<String> *p_delimiters) const override;
 	virtual bool is_using_templates() override;
 	virtual Ref<Script> make_template(const String &p_template, const String &p_class_name, const String &p_base_class_name) const override;
-	virtual Vector<ScriptTemplate> get_built_in_templates(StringName p_object) override;
+	virtual Vector<ScriptTemplate> get_built_in_templates(const StringName &p_object) override;
 	virtual bool validate(const String &p_script, const String &p_path = "", List<String> *r_functions = nullptr, List<ScriptLanguage::ScriptError> *r_errors = nullptr, List<ScriptLanguage::Warning> *r_warnings = nullptr, HashSet<int> *r_safe_lines = nullptr) const override;
 	virtual Script *create_script() const override;
 #ifndef DISABLE_DEPRECATED
diff --git a/modules/gdscript/gdscript_analyzer.cpp b/modules/gdscript/gdscript_analyzer.cpp
index b245df15a61..3fd5b3f519d 100644
--- a/modules/gdscript/gdscript_analyzer.cpp
+++ b/modules/gdscript/gdscript_analyzer.cpp
@@ -845,7 +845,7 @@ GDScriptParser::DataType GDScriptAnalyzer::resolve_datatype(GDScriptParser::Type
 	return result;
 }
 
-void GDScriptAnalyzer::resolve_class_member(GDScriptParser::ClassNode *p_class, StringName p_name, const GDScriptParser::Node *p_source) {
+void GDScriptAnalyzer::resolve_class_member(GDScriptParser::ClassNode *p_class, const StringName &p_name, const GDScriptParser::Node *p_source) {
 	ERR_FAIL_COND(!p_class->has_member(p_name));
 	resolve_class_member(p_class, p_class->members_indices[p_name], p_source);
 }
diff --git a/modules/gdscript/gdscript_analyzer.h b/modules/gdscript/gdscript_analyzer.h
index ec155706df0..4ed476a3df2 100644
--- a/modules/gdscript/gdscript_analyzer.h
+++ b/modules/gdscript/gdscript_analyzer.h
@@ -62,7 +62,7 @@ class GDScriptAnalyzer {
 	void decide_suite_type(GDScriptParser::Node *p_suite, GDScriptParser::Node *p_statement);
 
 	void resolve_annotation(GDScriptParser::AnnotationNode *p_annotation);
-	void resolve_class_member(GDScriptParser::ClassNode *p_class, StringName p_name, const GDScriptParser::Node *p_source = nullptr);
+	void resolve_class_member(GDScriptParser::ClassNode *p_class, const StringName &p_name, const GDScriptParser::Node *p_source = nullptr);
 	void resolve_class_member(GDScriptParser::ClassNode *p_class, int p_index, const GDScriptParser::Node *p_source = nullptr);
 	void resolve_class_interface(GDScriptParser::ClassNode *p_class, const GDScriptParser::Node *p_source = nullptr);
 	void resolve_class_interface(GDScriptParser::ClassNode *p_class, bool p_recursive);
diff --git a/modules/gdscript/gdscript_editor.cpp b/modules/gdscript/gdscript_editor.cpp
index b8fd5de4fd3..9ad2ba1914e 100644
--- a/modules/gdscript/gdscript_editor.cpp
+++ b/modules/gdscript/gdscript_editor.cpp
@@ -104,7 +104,7 @@ Ref<Script> GDScriptLanguage::make_template(const String &p_template, const Stri
 	return scr;
 }
 
-Vector<ScriptLanguage::ScriptTemplate> GDScriptLanguage::get_built_in_templates(StringName p_object) {
+Vector<ScriptLanguage::ScriptTemplate> GDScriptLanguage::get_built_in_templates(const StringName &p_object) {
 	Vector<ScriptLanguage::ScriptTemplate> templates;
 #ifdef TOOLS_ENABLED
 	for (int i = 0; i < TEMPLATES_ARRAY_SIZE; i++) {
@@ -537,7 +537,7 @@ struct GDScriptCompletionIdentifier {
 // appears. For example, if you are completing code in a class that inherits Node2D, a property found on Node2D
 // will have a "better" (lower) location "score" than a property that is found on CanvasItem.
 
-static int _get_property_location(StringName p_class, StringName p_property) {
+static int _get_property_location(const StringName &p_class, const StringName &p_property) {
 	if (!ClassDB::has_property(p_class, p_property)) {
 		return ScriptLanguage::LOCATION_OTHER;
 	}
@@ -552,7 +552,7 @@ static int _get_property_location(StringName p_class, StringName p_property) {
 	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
 }
 
-static int _get_constant_location(StringName p_class, StringName p_constant) {
+static int _get_constant_location(const StringName &p_class, const StringName &p_constant) {
 	if (!ClassDB::has_integer_constant(p_class, p_constant)) {
 		return ScriptLanguage::LOCATION_OTHER;
 	}
@@ -567,7 +567,7 @@ static int _get_constant_location(StringName p_class, StringName p_constant) {
 	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
 }
 
-static int _get_signal_location(StringName p_class, StringName p_signal) {
+static int _get_signal_location(const StringName &p_class, const StringName &p_signal) {
 	if (!ClassDB::has_signal(p_class, p_signal)) {
 		return ScriptLanguage::LOCATION_OTHER;
 	}
@@ -582,7 +582,7 @@ static int _get_signal_location(StringName p_class, StringName p_signal) {
 	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
 }
 
-static int _get_method_location(StringName p_class, StringName p_method) {
+static int _get_method_location(const StringName &p_class, const StringName &p_method) {
 	if (!ClassDB::has_method(p_class, p_method)) {
 		return ScriptLanguage::LOCATION_OTHER;
 	}
@@ -597,7 +597,7 @@ static int _get_method_location(StringName p_class, StringName p_method) {
 	return depth | ScriptLanguage::LOCATION_PARENT_MASK;
 }
 
-static int _get_enum_constant_location(StringName p_class, StringName p_enum_constant) {
+static int _get_enum_constant_location(const StringName &p_class, const StringName &p_enum_constant) {
 	if (!ClassDB::get_integer_constant_enum(p_class, p_enum_constant)) {
 		return ScriptLanguage::LOCATION_OTHER;
 	}
diff --git a/modules/gltf/gltf_document.cpp b/modules/gltf/gltf_document.cpp
index 0b491ce1d6f..db2866f9db5 100644
--- a/modules/gltf/gltf_document.cpp
+++ b/modules/gltf/gltf_document.cpp
@@ -5049,7 +5049,7 @@ Error GLTFDocument::_serialize_animations(Ref<GLTFState> p_state) {
 		AnimationPlayer *animation_player = p_state->animation_players[player_i];
 		List<StringName> animations;
 		animation_player->get_animation_list(&animations);
-		for (StringName animation_name : animations) {
+		for (const StringName &animation_name : animations) {
 			_convert_animation(p_state, animation_player, animation_name);
 		}
 	}
diff --git a/modules/gltf/structures/gltf_skeleton.h b/modules/gltf/structures/gltf_skeleton.h
index 72a4a06e5ce..b2f2dcb2a2d 100644
--- a/modules/gltf/structures/gltf_skeleton.h
+++ b/modules/gltf/structures/gltf_skeleton.h
@@ -82,7 +82,7 @@ public:
 	//RBMap<int32_t, GLTFNodeIndex> get_godot_bone_node() {
 	//	return this->godot_bone_node;
 	//}
-	//void set_godot_bone_node(RBMap<int32_t, GLTFNodeIndex> p_godot_bone_node) {
+	//void set_godot_bone_node(const RBMap<int32_t, GLTFNodeIndex> &p_godot_bone_node) {
 	//	this->godot_bone_node = p_godot_bone_node;
 	//}
 	Dictionary get_godot_bone_node();
diff --git a/modules/mono/csharp_script.cpp b/modules/mono/csharp_script.cpp
index 175e213579f..2bbd56776a9 100644
--- a/modules/mono/csharp_script.cpp
+++ b/modules/mono/csharp_script.cpp
@@ -371,7 +371,7 @@ Ref<Script> CSharpLanguage::make_template(const String &p_template, const String
 	return scr;
 }
 
-Vector<ScriptLanguage::ScriptTemplate> CSharpLanguage::get_built_in_templates(StringName p_object) {
+Vector<ScriptLanguage::ScriptTemplate> CSharpLanguage::get_built_in_templates(const StringName &p_object) {
 	Vector<ScriptLanguage::ScriptTemplate> templates;
 #ifdef TOOLS_ENABLED
 	for (int i = 0; i < TEMPLATES_ARRAY_SIZE; i++) {
diff --git a/modules/mono/csharp_script.h b/modules/mono/csharp_script.h
index 401f5c62e55..41e8d63be15 100644
--- a/modules/mono/csharp_script.h
+++ b/modules/mono/csharp_script.h
@@ -423,7 +423,7 @@ public:
 	void get_string_delimiters(List<String> *p_delimiters) const override;
 	bool is_using_templates() override;
 	virtual Ref<Script> make_template(const String &p_template, const String &p_class_name, const String &p_base_class_name) const override;
-	virtual Vector<ScriptTemplate> get_built_in_templates(StringName p_object) override;
+	virtual Vector<ScriptTemplate> get_built_in_templates(const StringName &p_object) override;
 	/* TODO */ bool validate(const String &p_script, const String &p_path, List<String> *r_functions,
 			List<ScriptLanguage::ScriptError> *r_errors = nullptr, List<ScriptLanguage::Warning> *r_warnings = nullptr, HashSet<int> *r_safe_lines = nullptr) const override {
 		return true;
diff --git a/modules/multiplayer/scene_replication_interface.cpp b/modules/multiplayer/scene_replication_interface.cpp
index c95e4ff9c99..31307e648de 100644
--- a/modules/multiplayer/scene_replication_interface.cpp
+++ b/modules/multiplayer/scene_replication_interface.cpp
@@ -707,7 +707,7 @@ MultiplayerSynchronizer *SceneReplicationInterface::_find_synchronizer(int p_pee
 	return sync;
 }
 
-void SceneReplicationInterface::_send_delta(int p_peer, const HashSet<ObjectID> p_synchronizers, uint64_t p_usec, const HashMap<ObjectID, uint64_t> p_last_watch_usecs) {
+void SceneReplicationInterface::_send_delta(int p_peer, const HashSet<ObjectID> &p_synchronizers, uint64_t p_usec, const HashMap<ObjectID, uint64_t> &p_last_watch_usecs) {
 	MAKE_ROOM(/* header */ 1 + /* element */ 4 + 8 + 4 + delta_mtu);
 	uint8_t *ptr = packet_cache.ptrw();
 	ptr[0] = SceneMultiplayer::NETWORK_COMMAND_SYNC | (1 << SceneMultiplayer::CMD_FLAG_0_SHIFT);
@@ -799,7 +799,7 @@ Error SceneReplicationInterface::on_delta_receive(int p_from, const uint8_t *p_b
 	return OK;
 }
 
-void SceneReplicationInterface::_send_sync(int p_peer, const HashSet<ObjectID> p_synchronizers, uint16_t p_sync_net_time, uint64_t p_usec) {
+void SceneReplicationInterface::_send_sync(int p_peer, const HashSet<ObjectID> &p_synchronizers, uint16_t p_sync_net_time, uint64_t p_usec) {
 	MAKE_ROOM(/* header */ 3 + /* element */ 4 + 4 + sync_mtu);
 	uint8_t *ptr = packet_cache.ptrw();
 	ptr[0] = SceneMultiplayer::NETWORK_COMMAND_SYNC;
diff --git a/modules/multiplayer/scene_replication_interface.h b/modules/multiplayer/scene_replication_interface.h
index 3b3ec6a9efb..31211bb108b 100644
--- a/modules/multiplayer/scene_replication_interface.h
+++ b/modules/multiplayer/scene_replication_interface.h
@@ -101,8 +101,8 @@ private:
 	bool _verify_synchronizer(int p_peer, MultiplayerSynchronizer *p_sync, uint32_t &r_net_id);
 	MultiplayerSynchronizer *_find_synchronizer(int p_peer, uint32_t p_net_ida);
 
-	void _send_sync(int p_peer, const HashSet<ObjectID> p_synchronizers, uint16_t p_sync_net_time, uint64_t p_usec);
-	void _send_delta(int p_peer, const HashSet<ObjectID> p_synchronizers, uint64_t p_usec, const HashMap<ObjectID, uint64_t> p_last_watch_usecs);
+	void _send_sync(int p_peer, const HashSet<ObjectID> &p_synchronizers, uint16_t p_sync_net_time, uint64_t p_usec);
+	void _send_delta(int p_peer, const HashSet<ObjectID> &p_synchronizers, uint64_t p_usec, const HashMap<ObjectID, uint64_t> &p_last_watch_usecs);
 	Error _make_spawn_packet(Node *p_node, MultiplayerSpawner *p_spawner, int &r_len);
 	Error _make_despawn_packet(Node *p_node, int &r_len);
 	Error _send_raw(const uint8_t *p_buffer, int p_size, int p_peer, bool p_reliable);
diff --git a/platform/android/java_godot_wrapper.cpp b/platform/android/java_godot_wrapper.cpp
index 4e401e633ee..3c950bb1b1d 100644
--- a/platform/android/java_godot_wrapper.cpp
+++ b/platform/android/java_godot_wrapper.cpp
@@ -334,7 +334,7 @@ void GodotJavaWrapper::vibrate(int p_duration_ms) {
 	}
 }
 
-int GodotJavaWrapper::create_new_godot_instance(List<String> args) {
+int GodotJavaWrapper::create_new_godot_instance(const List<String> &args) {
 	if (_create_new_godot_instance) {
 		JNIEnv *env = get_jni_env();
 		ERR_FAIL_NULL_V(env, 0);
diff --git a/platform/android/java_godot_wrapper.h b/platform/android/java_godot_wrapper.h
index 52043c6027b..93998021a93 100644
--- a/platform/android/java_godot_wrapper.h
+++ b/platform/android/java_godot_wrapper.h
@@ -104,7 +104,7 @@ public:
 	void init_input_devices();
 	void vibrate(int p_duration_ms);
 	String get_input_fallback_mapping();
-	int create_new_godot_instance(List<String> args);
+	int create_new_godot_instance(const List<String> &args);
 	void begin_benchmark_measure(const String &p_context, const String &p_label);
 	void end_benchmark_measure(const String &p_context, const String &p_label);
 	void dump_benchmark(const String &benchmark_file);
diff --git a/platform/web/export/export_plugin.cpp b/platform/web/export/export_plugin.cpp
index a70812cf5b1..ee170280e22 100644
--- a/platform/web/export/export_plugin.cpp
+++ b/platform/web/export/export_plugin.cpp
@@ -112,7 +112,7 @@ Error EditorExportPlatformWeb::_write_or_error(const uint8_t *p_content, int p_s
 	return OK;
 }
 
-void EditorExportPlatformWeb::_replace_strings(HashMap<String, String> p_replaces, Vector<uint8_t> &r_template) {
+void EditorExportPlatformWeb::_replace_strings(const HashMap<String, String> &p_replaces, Vector<uint8_t> &r_template) {
 	String str_template = String::utf8(reinterpret_cast<const char *>(r_template.ptr()), r_template.size());
 	String out;
 	Vector<String> lines = str_template.split("\n");
diff --git a/platform/web/export/export_plugin.h b/platform/web/export/export_plugin.h
index 887000ac454..9bb82d472e3 100644
--- a/platform/web/export/export_plugin.h
+++ b/platform/web/export/export_plugin.h
@@ -90,7 +90,7 @@ class EditorExportPlatformWeb : public EditorExportPlatform {
 	}
 
 	Error _extract_template(const String &p_template, const String &p_dir, const String &p_name, bool pwa);
-	void _replace_strings(HashMap<String, String> p_replaces, Vector<uint8_t> &r_template);
+	void _replace_strings(const HashMap<String, String> &p_replaces, Vector<uint8_t> &r_template);
 	void _fix_html(Vector<uint8_t> &p_html, const Ref<EditorExportPreset> &p_preset, const String &p_name, bool p_debug, int p_flags, const Vector<SharedObject> p_shared_objects, const Dictionary &p_file_sizes);
 	Error _add_manifest_icon(const String &p_path, const String &p_icon, int p_size, Array &r_arr);
 	Error _build_pwa(const Ref<EditorExportPreset> &p_preset, const String p_path, const Vector<SharedObject> &p_shared_objects);
diff --git a/scene/3d/visual_instance_3d.cpp b/scene/3d/visual_instance_3d.cpp
index 33f865382db..503c39ae3e9 100644
--- a/scene/3d/visual_instance_3d.cpp
+++ b/scene/3d/visual_instance_3d.cpp
@@ -250,7 +250,7 @@ GeometryInstance3D::VisibilityRangeFadeMode GeometryInstance3D::get_visibility_r
 	return visibility_range_fade_mode;
 }
 
-const StringName *GeometryInstance3D::_instance_uniform_get_remap(const StringName p_name) const {
+const StringName *GeometryInstance3D::_instance_uniform_get_remap(const StringName &p_name) const {
 	StringName *r = instance_shader_parameter_property_remap.getptr(p_name);
 	if (!r) {
 		String s = p_name;
diff --git a/scene/3d/visual_instance_3d.h b/scene/3d/visual_instance_3d.h
index ef0f7966e21..59ede26ac1b 100644
--- a/scene/3d/visual_instance_3d.h
+++ b/scene/3d/visual_instance_3d.h
@@ -135,7 +135,7 @@ private:
 	GIMode gi_mode = GI_MODE_STATIC;
 	bool ignore_occlusion_culling = false;
 
-	const StringName *_instance_uniform_get_remap(const StringName p_name) const;
+	const StringName *_instance_uniform_get_remap(const StringName &p_name) const;
 
 protected:
 	bool _set(const StringName &p_name, const Variant &p_value);
diff --git a/scene/3d/xr_nodes.cpp b/scene/3d/xr_nodes.cpp
index c12e78eddcd..70e32c1a310 100644
--- a/scene/3d/xr_nodes.cpp
+++ b/scene/3d/xr_nodes.cpp
@@ -58,13 +58,13 @@ void XRCamera3D::_unbind_tracker() {
 	tracker.unref();
 }
 
-void XRCamera3D::_changed_tracker(const StringName p_tracker_name, int p_tracker_type) {
+void XRCamera3D::_changed_tracker(const StringName &p_tracker_name, int p_tracker_type) {
 	if (p_tracker_name == tracker_name) {
 		_bind_tracker();
 	}
 }
 
-void XRCamera3D::_removed_tracker(const StringName p_tracker_name, int p_tracker_type) {
+void XRCamera3D::_removed_tracker(const StringName &p_tracker_name, int p_tracker_type) {
 	if (p_tracker_name == tracker_name) {
 		_unbind_tracker();
 	}
@@ -258,7 +258,7 @@ void XRNode3D::_validate_property(PropertyInfo &p_property) const {
 	}
 }
 
-void XRNode3D::set_tracker(const StringName p_tracker_name) {
+void XRNode3D::set_tracker(const StringName &p_tracker_name) {
 	if (tracker.is_valid() && tracker->get_tracker_name() == p_tracker_name) {
 		// didn't change
 		return;
@@ -282,7 +282,7 @@ StringName XRNode3D::get_tracker() const {
 	return tracker_name;
 }
 
-void XRNode3D::set_pose_name(const StringName p_pose_name) {
+void XRNode3D::set_pose_name(const StringName &p_pose_name) {
 	pose_name = p_pose_name;
 
 	// Update pose if we are bound to a tracker with a valid pose
@@ -363,7 +363,7 @@ void XRNode3D::_unbind_tracker() {
 	}
 }
 
-void XRNode3D::_changed_tracker(const StringName p_tracker_name, int p_tracker_type) {
+void XRNode3D::_changed_tracker(const StringName &p_tracker_name, int p_tracker_type) {
 	if (tracker_name == p_tracker_name) {
 		// just in case unref our current tracker
 		_unbind_tracker();
@@ -373,7 +373,7 @@ void XRNode3D::_changed_tracker(const StringName p_tracker_name, int p_tracker_t
 	}
 }
 
-void XRNode3D::_removed_tracker(const StringName p_tracker_name, int p_tracker_type) {
+void XRNode3D::_removed_tracker(const StringName &p_tracker_name, int p_tracker_type) {
 	if (tracker_name == p_tracker_name) {
 		// unref our tracker, it's no longer available
 		_unbind_tracker();
diff --git a/scene/3d/xr_nodes.h b/scene/3d/xr_nodes.h
index 185a6361d39..ad52cf113d1 100644
--- a/scene/3d/xr_nodes.h
+++ b/scene/3d/xr_nodes.h
@@ -50,8 +50,8 @@ protected:
 
 	void _bind_tracker();
 	void _unbind_tracker();
-	void _changed_tracker(const StringName p_tracker_name, int p_tracker_type);
-	void _removed_tracker(const StringName p_tracker_name, int p_tracker_type);
+	void _changed_tracker(const StringName &p_tracker_name, int p_tracker_type);
+	void _removed_tracker(const StringName &p_tracker_name, int p_tracker_type);
 	void _pose_changed(const Ref<XRPose> &p_pose);
 
 public:
@@ -87,8 +87,8 @@ protected:
 
 	virtual void _bind_tracker();
 	virtual void _unbind_tracker();
-	void _changed_tracker(const StringName p_tracker_name, int p_tracker_type);
-	void _removed_tracker(const StringName p_tracker_name, int p_tracker_type);
+	void _changed_tracker(const StringName &p_tracker_name, int p_tracker_type);
+	void _removed_tracker(const StringName &p_tracker_name, int p_tracker_type);
 
 	void _pose_changed(const Ref<XRPose> &p_pose);
 	void _pose_lost_tracking(const Ref<XRPose> &p_pose);
@@ -96,10 +96,10 @@ protected:
 
 public:
 	void _validate_property(PropertyInfo &p_property) const;
-	void set_tracker(const StringName p_tracker_name);
+	void set_tracker(const StringName &p_tracker_name);
 	StringName get_tracker() const;
 
-	void set_pose_name(const StringName p_pose);
+	void set_pose_name(const StringName &p_pose);
 	StringName get_pose_name() const;
 
 	bool get_is_active() const;
diff --git a/scene/animation/animation_mixer.cpp b/scene/animation/animation_mixer.cpp
index 2338c305de5..637b3917c76 100644
--- a/scene/animation/animation_mixer.cpp
+++ b/scene/animation/animation_mixer.cpp
@@ -2166,7 +2166,7 @@ AnimationMixer::AnimationMixer() {
 AnimationMixer::~AnimationMixer() {
 }
 
-void AnimatedValuesBackup::set_data(const HashMap<NodePath, AnimationMixer::TrackCache *> p_data) {
+void AnimatedValuesBackup::set_data(const HashMap<NodePath, AnimationMixer::TrackCache *> &p_data) {
 	clear_data();
 
 	for (const KeyValue<NodePath, AnimationMixer::TrackCache *> &E : p_data) {
diff --git a/scene/animation/animation_mixer.h b/scene/animation/animation_mixer.h
index ffa6dc2e555..ecc8ab85de4 100644
--- a/scene/animation/animation_mixer.h
+++ b/scene/animation/animation_mixer.h
@@ -447,7 +447,7 @@ class AnimatedValuesBackup : public RefCounted {
 	HashMap<NodePath, AnimationMixer::TrackCache *> data;
 
 public:
-	void set_data(const HashMap<NodePath, AnimationMixer::TrackCache *> p_data);
+	void set_data(const HashMap<NodePath, AnimationMixer::TrackCache *> &p_data);
 	HashMap<NodePath, AnimationMixer::TrackCache *> get_data() const;
 	void clear_data();
 
diff --git a/scene/gui/graph_edit_arranger.cpp b/scene/gui/graph_edit_arranger.cpp
index 345421db31b..29c3056b3b8 100644
--- a/scene/gui/graph_edit_arranger.cpp
+++ b/scene/gui/graph_edit_arranger.cpp
@@ -421,7 +421,7 @@ void GraphEditArranger::_calculate_inner_shifts(Dictionary &r_inner_shifts, cons
 	}
 }
 
-float GraphEditArranger::_calculate_threshold(StringName p_v, StringName p_w, const Dictionary &r_node_names, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_inner_shift, real_t p_current_threshold, const HashMap<StringName, Vector2> &r_node_positions) {
+float GraphEditArranger::_calculate_threshold(const StringName &p_v, const StringName &p_w, const Dictionary &r_node_names, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_inner_shift, real_t p_current_threshold, const HashMap<StringName, Vector2> &r_node_positions) {
 #define MAX_ORDER 2147483647
 #define ORDER(node, layers)                            \
 	for (unsigned int i = 0; i < layers.size(); i++) { \
@@ -503,7 +503,7 @@ float GraphEditArranger::_calculate_threshold(StringName p_v, StringName p_w, co
 	return threshold;
 }
 
-void GraphEditArranger::_place_block(StringName p_v, float p_delta, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_node_name, const Dictionary &r_inner_shift, Dictionary &r_sink, Dictionary &r_shift, HashMap<StringName, Vector2> &r_node_positions) {
+void GraphEditArranger::_place_block(const StringName &p_v, float p_delta, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_node_name, const Dictionary &r_inner_shift, Dictionary &r_sink, Dictionary &r_shift, HashMap<StringName, Vector2> &r_node_positions) {
 #define PRED(node, layers)                             \
 	for (unsigned int i = 0; i < layers.size(); i++) { \
 		int index = layers[i].find(node);              \
diff --git a/scene/gui/graph_edit_arranger.h b/scene/gui/graph_edit_arranger.h
index e79944e5dde..925b58d428d 100644
--- a/scene/gui/graph_edit_arranger.h
+++ b/scene/gui/graph_edit_arranger.h
@@ -54,8 +54,8 @@ class GraphEditArranger : public RefCounted {
 	void _horizontal_alignment(Dictionary &r_root, Dictionary &r_align, const HashMap<int, Vector<StringName>> &r_layers, const HashMap<StringName, HashSet<StringName>> &r_upper_neighbours, const HashSet<StringName> &r_selected_nodes);
 	void _crossing_minimisation(HashMap<int, Vector<StringName>> &r_layers, const HashMap<StringName, HashSet<StringName>> &r_upper_neighbours);
 	void _calculate_inner_shifts(Dictionary &r_inner_shifts, const Dictionary &r_root, const Dictionary &r_node_names, const Dictionary &r_align, const HashSet<StringName> &r_block_heads, const HashMap<StringName, Pair<int, int>> &r_port_info);
-	float _calculate_threshold(StringName p_v, StringName p_w, const Dictionary &r_node_names, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_inner_shift, real_t p_current_threshold, const HashMap<StringName, Vector2> &r_node_positions);
-	void _place_block(StringName p_v, float p_delta, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_node_name, const Dictionary &r_inner_shift, Dictionary &r_sink, Dictionary &r_shift, HashMap<StringName, Vector2> &r_node_positions);
+	float _calculate_threshold(const StringName &p_v, const StringName &p_w, const Dictionary &r_node_names, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_inner_shift, real_t p_current_threshold, const HashMap<StringName, Vector2> &r_node_positions);
+	void _place_block(const StringName &p_v, float p_delta, const HashMap<int, Vector<StringName>> &r_layers, const Dictionary &r_root, const Dictionary &r_align, const Dictionary &r_node_name, const Dictionary &r_inner_shift, Dictionary &r_sink, Dictionary &r_shift, HashMap<StringName, Vector2> &r_node_positions);
 
 public:
 	void arrange_nodes();
diff --git a/scene/resources/bone_map.cpp b/scene/resources/bone_map.cpp
index 5363b8ec79c..97e3af726af 100644
--- a/scene/resources/bone_map.cpp
+++ b/scene/resources/bone_map.cpp
@@ -77,22 +77,22 @@ void BoneMap::set_profile(const Ref<SkeletonProfile> &p_profile) {
 	notify_property_list_changed();
 }
 
-StringName BoneMap::get_skeleton_bone_name(StringName p_profile_bone_name) const {
+StringName BoneMap::get_skeleton_bone_name(const StringName &p_profile_bone_name) const {
 	ERR_FAIL_COND_V(!bone_map.has(p_profile_bone_name), StringName());
 	return bone_map.get(p_profile_bone_name);
 }
 
-void BoneMap::_set_skeleton_bone_name(StringName p_profile_bone_name, const StringName p_skeleton_bone_name) {
+void BoneMap::_set_skeleton_bone_name(const StringName &p_profile_bone_name, const StringName &p_skeleton_bone_name) {
 	ERR_FAIL_COND(!bone_map.has(p_profile_bone_name));
 	bone_map.insert(p_profile_bone_name, p_skeleton_bone_name);
 }
 
-void BoneMap::set_skeleton_bone_name(StringName p_profile_bone_name, const StringName p_skeleton_bone_name) {
+void BoneMap::set_skeleton_bone_name(const StringName &p_profile_bone_name, const StringName &p_skeleton_bone_name) {
 	_set_skeleton_bone_name(p_profile_bone_name, p_skeleton_bone_name);
 	emit_signal("bone_map_updated");
 }
 
-StringName BoneMap::find_profile_bone_name(StringName p_skeleton_bone_name) const {
+StringName BoneMap::find_profile_bone_name(const StringName &p_skeleton_bone_name) const {
 	StringName profile_bone_name;
 	HashMap<StringName, StringName>::ConstIterator E = bone_map.begin();
 	while (E) {
@@ -105,7 +105,7 @@ StringName BoneMap::find_profile_bone_name(StringName p_skeleton_bone_name) cons
 	return profile_bone_name;
 }
 
-int BoneMap::get_skeleton_bone_name_count(const StringName p_skeleton_bone_name) const {
+int BoneMap::get_skeleton_bone_name_count(const StringName &p_skeleton_bone_name) const {
 	int count = 0;
 	HashMap<StringName, StringName>::ConstIterator E = bone_map.begin();
 	while (E) {
diff --git a/scene/resources/bone_map.h b/scene/resources/bone_map.h
index 983a3b7b5af..fbd2f92dee4 100644
--- a/scene/resources/bone_map.h
+++ b/scene/resources/bone_map.h
@@ -53,13 +53,13 @@ public:
 	Ref<SkeletonProfile> get_profile() const;
 	void set_profile(const Ref<SkeletonProfile> &p_profile);
 
-	int get_skeleton_bone_name_count(const StringName p_skeleton_bone_name) const;
+	int get_skeleton_bone_name_count(const StringName &p_skeleton_bone_name) const;
 
-	StringName get_skeleton_bone_name(StringName p_profile_bone_name) const;
-	void set_skeleton_bone_name(StringName p_profile_bone_name, const StringName p_skeleton_bone_name);
-	void _set_skeleton_bone_name(StringName p_profile_bone_name, const StringName p_skeleton_bone_name); // Avoid to emit signal for editor.
+	StringName get_skeleton_bone_name(const StringName &p_profile_bone_name) const;
+	void set_skeleton_bone_name(const StringName &p_profile_bone_name, const StringName &p_skeleton_bone_name);
+	void _set_skeleton_bone_name(const StringName &p_profile_bone_name, const StringName &p_skeleton_bone_name); // Avoid to emit signal for editor.
 
-	StringName find_profile_bone_name(StringName p_skeleton_bone_name) const;
+	StringName find_profile_bone_name(const StringName &p_skeleton_bone_name) const;
 
 	BoneMap();
 	~BoneMap();
diff --git a/scene/resources/material.cpp b/scene/resources/material.cpp
index dba4e4eb347..74b1157e5ff 100644
--- a/scene/resources/material.cpp
+++ b/scene/resources/material.cpp
@@ -1947,7 +1947,7 @@ Ref<Texture2D> BaseMaterial3D::get_texture(TextureParam p_param) const {
 	return textures[p_param];
 }
 
-Ref<Texture2D> BaseMaterial3D::get_texture_by_name(StringName p_name) const {
+Ref<Texture2D> BaseMaterial3D::get_texture_by_name(const StringName &p_name) const {
 	for (int i = 0; i < (int)BaseMaterial3D::TEXTURE_MAX; i++) {
 		TextureParam param = TextureParam(i);
 		if (p_name == shader_names->texture_names[param]) {
diff --git a/scene/resources/material.h b/scene/resources/material.h
index 1c698cb1044..06522e64701 100644
--- a/scene/resources/material.h
+++ b/scene/resources/material.h
@@ -682,7 +682,7 @@ public:
 	void set_texture(TextureParam p_param, const Ref<Texture2D> &p_texture);
 	Ref<Texture2D> get_texture(TextureParam p_param) const;
 	// Used only for shader material conversion
-	Ref<Texture2D> get_texture_by_name(StringName p_name) const;
+	Ref<Texture2D> get_texture_by_name(const StringName &p_name) const;
 
 	void set_texture_filter(TextureFilter p_filter);
 	TextureFilter get_texture_filter() const;
diff --git a/scene/resources/navigation_mesh.cpp b/scene/resources/navigation_mesh.cpp
index 82b5c6257c0..dd2e7ef2681 100644
--- a/scene/resources/navigation_mesh.cpp
+++ b/scene/resources/navigation_mesh.cpp
@@ -127,7 +127,7 @@ NavigationMesh::SourceGeometryMode NavigationMesh::get_source_geometry_mode() co
 	return source_geometry_mode;
 }
 
-void NavigationMesh::set_source_group_name(StringName p_group_name) {
+void NavigationMesh::set_source_group_name(const StringName &p_group_name) {
 	source_group_name = p_group_name;
 }
 
diff --git a/scene/resources/navigation_mesh.h b/scene/resources/navigation_mesh.h
index 8b9b810038c..cb8880eb94f 100644
--- a/scene/resources/navigation_mesh.h
+++ b/scene/resources/navigation_mesh.h
@@ -122,7 +122,7 @@ public:
 	void set_source_geometry_mode(SourceGeometryMode p_geometry_mode);
 	SourceGeometryMode get_source_geometry_mode() const;
 
-	void set_source_group_name(StringName p_group_name);
+	void set_source_group_name(const StringName &p_group_name);
 	StringName get_source_group_name() const;
 
 	void set_cell_size(float p_value);
diff --git a/scene/resources/navigation_polygon.cpp b/scene/resources/navigation_polygon.cpp
index 52840eaa657..2770cb0b87e 100644
--- a/scene/resources/navigation_polygon.cpp
+++ b/scene/resources/navigation_polygon.cpp
@@ -393,7 +393,7 @@ NavigationPolygon::SourceGeometryMode NavigationPolygon::get_source_geometry_mod
 	return source_geometry_mode;
 }
 
-void NavigationPolygon::set_source_geometry_group_name(StringName p_group_name) {
+void NavigationPolygon::set_source_geometry_group_name(const StringName &p_group_name) {
 	source_geometry_group_name = p_group_name;
 }
 
diff --git a/scene/resources/navigation_polygon.h b/scene/resources/navigation_polygon.h
index 4a6a97e2e72..e589ad6dce2 100644
--- a/scene/resources/navigation_polygon.h
+++ b/scene/resources/navigation_polygon.h
@@ -127,7 +127,7 @@ public:
 	void set_source_geometry_mode(SourceGeometryMode p_geometry_mode);
 	SourceGeometryMode get_source_geometry_mode() const;
 
-	void set_source_geometry_group_name(StringName p_group_name);
+	void set_source_geometry_group_name(const StringName &p_group_name);
 	StringName get_source_geometry_group_name() const;
 
 	void set_agent_radius(real_t p_value);
diff --git a/scene/resources/skeleton_profile.cpp b/scene/resources/skeleton_profile.cpp
index da4b1f7311b..24ed480289c 100644
--- a/scene/resources/skeleton_profile.cpp
+++ b/scene/resources/skeleton_profile.cpp
@@ -180,7 +180,7 @@ StringName SkeletonProfile::get_root_bone() {
 	return root_bone;
 }
 
-void SkeletonProfile::set_root_bone(StringName p_bone_name) {
+void SkeletonProfile::set_root_bone(const StringName &p_bone_name) {
 	if (is_read_only) {
 		return;
 	}
@@ -191,7 +191,7 @@ StringName SkeletonProfile::get_scale_base_bone() {
 	return scale_base_bone;
 }
 
-void SkeletonProfile::set_scale_base_bone(StringName p_bone_name) {
+void SkeletonProfile::set_scale_base_bone(const StringName &p_bone_name) {
 	if (is_read_only) {
 		return;
 	}
@@ -217,7 +217,7 @@ StringName SkeletonProfile::get_group_name(int p_group_idx) const {
 	return groups[p_group_idx].group_name;
 }
 
-void SkeletonProfile::set_group_name(int p_group_idx, const StringName p_group_name) {
+void SkeletonProfile::set_group_name(int p_group_idx, const StringName &p_group_name) {
 	if (is_read_only) {
 		return;
 	}
@@ -254,7 +254,7 @@ void SkeletonProfile::set_bone_size(int p_size) {
 	notify_property_list_changed();
 }
 
-int SkeletonProfile::find_bone(StringName p_bone_name) const {
+int SkeletonProfile::find_bone(const StringName &p_bone_name) const {
 	if (p_bone_name == StringName()) {
 		return -1;
 	}
@@ -271,7 +271,7 @@ StringName SkeletonProfile::get_bone_name(int p_bone_idx) const {
 	return bones[p_bone_idx].bone_name;
 }
 
-void SkeletonProfile::set_bone_name(int p_bone_idx, const StringName p_bone_name) {
+void SkeletonProfile::set_bone_name(int p_bone_idx, const StringName &p_bone_name) {
 	if (is_read_only) {
 		return;
 	}
@@ -285,7 +285,7 @@ StringName SkeletonProfile::get_bone_parent(int p_bone_idx) const {
 	return bones[p_bone_idx].bone_parent;
 }
 
-void SkeletonProfile::set_bone_parent(int p_bone_idx, const StringName p_bone_parent) {
+void SkeletonProfile::set_bone_parent(int p_bone_idx, const StringName &p_bone_parent) {
 	if (is_read_only) {
 		return;
 	}
@@ -314,7 +314,7 @@ StringName SkeletonProfile::get_bone_tail(int p_bone_idx) const {
 	return bones[p_bone_idx].bone_tail;
 }
 
-void SkeletonProfile::set_bone_tail(int p_bone_idx, const StringName p_bone_tail) {
+void SkeletonProfile::set_bone_tail(int p_bone_idx, const StringName &p_bone_tail) {
 	if (is_read_only) {
 		return;
 	}
@@ -356,7 +356,7 @@ StringName SkeletonProfile::get_group(int p_bone_idx) const {
 	return bones[p_bone_idx].group;
 }
 
-void SkeletonProfile::set_group(int p_bone_idx, const StringName p_group) {
+void SkeletonProfile::set_group(int p_bone_idx, const StringName &p_group) {
 	if (is_read_only) {
 		return;
 	}
@@ -379,7 +379,7 @@ void SkeletonProfile::set_require(int p_bone_idx, const bool p_require) {
 	emit_signal("profile_updated");
 }
 
-bool SkeletonProfile::has_bone(StringName p_bone_name) {
+bool SkeletonProfile::has_bone(const StringName &p_bone_name) {
 	bool is_found = false;
 	for (int i = 0; i < bones.size(); i++) {
 		if (bones[i].bone_name == p_bone_name) {
diff --git a/scene/resources/skeleton_profile.h b/scene/resources/skeleton_profile.h
index 418a051976a..143f495c61b 100644
--- a/scene/resources/skeleton_profile.h
+++ b/scene/resources/skeleton_profile.h
@@ -78,16 +78,16 @@ protected:
 
 public:
 	StringName get_root_bone();
-	void set_root_bone(StringName p_bone_name);
+	void set_root_bone(const StringName &p_bone_name);
 
 	StringName get_scale_base_bone();
-	void set_scale_base_bone(StringName p_bone_name);
+	void set_scale_base_bone(const StringName &p_bone_name);
 
 	int get_group_size();
 	void set_group_size(int p_size);
 
 	StringName get_group_name(int p_group_idx) const;
-	void set_group_name(int p_group_idx, const StringName p_group_name);
+	void set_group_name(int p_group_idx, const StringName &p_group_name);
 
 	Ref<Texture2D> get_texture(int p_group_idx) const;
 	void set_texture(int p_group_idx, const Ref<Texture2D> &p_texture);
@@ -95,19 +95,19 @@ public:
 	int get_bone_size();
 	void set_bone_size(int p_size);
 
-	int find_bone(const StringName p_bone_name) const;
+	int find_bone(const StringName &p_bone_name) const;
 
 	StringName get_bone_name(int p_bone_idx) const;
-	void set_bone_name(int p_bone_idx, const StringName p_bone_name);
+	void set_bone_name(int p_bone_idx, const StringName &p_bone_name);
 
 	StringName get_bone_parent(int p_bone_idx) const;
-	void set_bone_parent(int p_bone_idx, const StringName p_bone_parent);
+	void set_bone_parent(int p_bone_idx, const StringName &p_bone_parent);
 
 	TailDirection get_tail_direction(int p_bone_idx) const;
 	void set_tail_direction(int p_bone_idx, const TailDirection p_tail_direction);
 
 	StringName get_bone_tail(int p_bone_idx) const;
-	void set_bone_tail(int p_bone_idx, const StringName p_bone_tail);
+	void set_bone_tail(int p_bone_idx, const StringName &p_bone_tail);
 
 	Transform3D get_reference_pose(int p_bone_idx) const;
 	void set_reference_pose(int p_bone_idx, const Transform3D p_reference_pose);
@@ -116,12 +116,12 @@ public:
 	void set_handle_offset(int p_bone_idx, const Vector2 p_handle_offset);
 
 	StringName get_group(int p_bone_idx) const;
-	void set_group(int p_bone_idx, const StringName p_group);
+	void set_group(int p_bone_idx, const StringName &p_group);
 
 	bool is_require(int p_bone_idx) const;
 	void set_require(int p_bone_idx, const bool p_require);
 
-	bool has_bone(StringName p_bone_name);
+	bool has_bone(const StringName &p_bone_name);
 
 	SkeletonProfile();
 	~SkeletonProfile();
diff --git a/scene/resources/theme.cpp b/scene/resources/theme.cpp
index d57a0f6b387..e5a4b7c6e6e 100644
--- a/scene/resources/theme.cpp
+++ b/scene/resources/theme.cpp
@@ -322,7 +322,7 @@ void Theme::clear_icon(const StringName &p_name, const StringName &p_theme_type)
 	_emit_theme_changed(true);
 }
 
-void Theme::get_icon_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_icon_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!icon_map.has(p_theme_type)) {
@@ -432,7 +432,7 @@ void Theme::clear_stylebox(const StringName &p_name, const StringName &p_theme_t
 	_emit_theme_changed(true);
 }
 
-void Theme::get_stylebox_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_stylebox_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!style_map.has(p_theme_type)) {
@@ -544,7 +544,7 @@ void Theme::clear_font(const StringName &p_name, const StringName &p_theme_type)
 	_emit_theme_changed(true);
 }
 
-void Theme::get_font_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_font_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!font_map.has(p_theme_type)) {
@@ -643,7 +643,7 @@ void Theme::clear_font_size(const StringName &p_name, const StringName &p_theme_
 	_emit_theme_changed(true);
 }
 
-void Theme::get_font_size_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_font_size_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!font_size_map.has(p_theme_type)) {
@@ -729,7 +729,7 @@ void Theme::clear_color(const StringName &p_name, const StringName &p_theme_type
 	_emit_theme_changed(true);
 }
 
-void Theme::get_color_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_color_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!color_map.has(p_theme_type)) {
@@ -815,7 +815,7 @@ void Theme::clear_constant(const StringName &p_name, const StringName &p_theme_t
 	_emit_theme_changed(true);
 }
 
-void Theme::get_constant_list(StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_constant_list(const StringName &p_theme_type, List<StringName> *p_list) const {
 	ERR_FAIL_NULL(p_list);
 
 	if (!constant_map.has(p_theme_type)) {
@@ -1009,7 +1009,7 @@ void Theme::clear_theme_item(DataType p_data_type, const StringName &p_name, con
 	}
 }
 
-void Theme::get_theme_item_list(DataType p_data_type, StringName p_theme_type, List<StringName> *p_list) const {
+void Theme::get_theme_item_list(DataType p_data_type, const StringName &p_theme_type, List<StringName> *p_list) const {
 	switch (p_data_type) {
 		case DATA_TYPE_COLOR:
 			get_color_list(p_theme_type, p_list);
diff --git a/scene/resources/theme.h b/scene/resources/theme.h
index b26b5b5e841..73f1167c297 100644
--- a/scene/resources/theme.h
+++ b/scene/resources/theme.h
@@ -136,7 +136,7 @@ public:
 	bool has_icon_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_icon(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_icon(const StringName &p_name, const StringName &p_theme_type);
-	void get_icon_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_icon_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_icon_type(const StringName &p_theme_type);
 	void remove_icon_type(const StringName &p_theme_type);
 	void get_icon_type_list(List<StringName> *p_list) const;
@@ -147,7 +147,7 @@ public:
 	bool has_stylebox_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_stylebox(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_stylebox(const StringName &p_name, const StringName &p_theme_type);
-	void get_stylebox_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_stylebox_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_stylebox_type(const StringName &p_theme_type);
 	void remove_stylebox_type(const StringName &p_theme_type);
 	void get_stylebox_type_list(List<StringName> *p_list) const;
@@ -158,7 +158,7 @@ public:
 	bool has_font_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_font(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_font(const StringName &p_name, const StringName &p_theme_type);
-	void get_font_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_font_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_font_type(const StringName &p_theme_type);
 	void remove_font_type(const StringName &p_theme_type);
 	void get_font_type_list(List<StringName> *p_list) const;
@@ -169,7 +169,7 @@ public:
 	bool has_font_size_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_font_size(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_font_size(const StringName &p_name, const StringName &p_theme_type);
-	void get_font_size_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_font_size_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_font_size_type(const StringName &p_theme_type);
 	void remove_font_size_type(const StringName &p_theme_type);
 	void get_font_size_type_list(List<StringName> *p_list) const;
@@ -180,7 +180,7 @@ public:
 	bool has_color_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_color(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_color(const StringName &p_name, const StringName &p_theme_type);
-	void get_color_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_color_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_color_type(const StringName &p_theme_type);
 	void remove_color_type(const StringName &p_theme_type);
 	void get_color_type_list(List<StringName> *p_list) const;
@@ -191,7 +191,7 @@ public:
 	bool has_constant_nocheck(const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_constant(const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_constant(const StringName &p_name, const StringName &p_theme_type);
-	void get_constant_list(StringName p_theme_type, List<StringName> *p_list) const;
+	void get_constant_list(const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_constant_type(const StringName &p_theme_type);
 	void remove_constant_type(const StringName &p_theme_type);
 	void get_constant_type_list(List<StringName> *p_list) const;
@@ -202,7 +202,7 @@ public:
 	bool has_theme_item_nocheck(DataType p_data_type, const StringName &p_name, const StringName &p_theme_type) const;
 	void rename_theme_item(DataType p_data_type, const StringName &p_old_name, const StringName &p_name, const StringName &p_theme_type);
 	void clear_theme_item(DataType p_data_type, const StringName &p_name, const StringName &p_theme_type);
-	void get_theme_item_list(DataType p_data_type, StringName p_theme_type, List<StringName> *p_list) const;
+	void get_theme_item_list(DataType p_data_type, const StringName &p_theme_type, List<StringName> *p_list) const;
 	void add_theme_item_type(DataType p_data_type, const StringName &p_theme_type);
 	void remove_theme_item_type(DataType p_data_type, const StringName &p_theme_type);
 	void get_theme_item_type_list(DataType p_data_type, List<StringName> *p_list) const;
diff --git a/scene/theme/theme_owner.cpp b/scene/theme/theme_owner.cpp
index 2852a64e39f..b559c8c58dd 100644
--- a/scene/theme/theme_owner.cpp
+++ b/scene/theme/theme_owner.cpp
@@ -249,7 +249,7 @@ void ThemeOwner::get_theme_type_dependencies(const Node *p_for_node, const Strin
 	ThemeDB::get_singleton()->get_native_type_dependencies(p_theme_type, r_list);
 }
 
-Variant ThemeOwner::get_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, List<StringName> p_theme_types) {
+Variant ThemeOwner::get_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types) {
 	ERR_FAIL_COND_V_MSG(p_theme_types.size() == 0, Variant(), "At least one theme type must be specified.");
 
 	// First, look through each control or window node in the branch, until no valid parent can be found.
@@ -285,7 +285,7 @@ Variant ThemeOwner::get_theme_item_in_types(Theme::DataType p_data_type, const S
 	return global_context->get_fallback_theme()->get_theme_item(p_data_type, p_name, StringName());
 }
 
-bool ThemeOwner::has_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, List<StringName> p_theme_types) {
+bool ThemeOwner::has_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types) {
 	ERR_FAIL_COND_V_MSG(p_theme_types.size() == 0, false, "At least one theme type must be specified.");
 
 	// First, look through each control or window node in the branch, until no valid parent can be found.
diff --git a/scene/theme/theme_owner.h b/scene/theme/theme_owner.h
index 4923ccb00b7..7e19279c2a6 100644
--- a/scene/theme/theme_owner.h
+++ b/scene/theme/theme_owner.h
@@ -71,8 +71,8 @@ public:
 
 	void get_theme_type_dependencies(const Node *p_for_node, const StringName &p_theme_type, List<StringName> *r_list) const;
 
-	Variant get_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, List<StringName> p_theme_types);
-	bool has_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, List<StringName> p_theme_types);
+	Variant get_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types);
+	bool has_theme_item_in_types(Theme::DataType p_data_type, const StringName &p_name, const List<StringName> &p_theme_types);
 
 	float get_theme_default_base_scale();
 	Ref<Font> get_theme_default_font();
diff --git a/servers/audio_server.cpp b/servers/audio_server.cpp
index 026bc6675ac..86bdd13c801 100644
--- a/servers/audio_server.cpp
+++ b/servers/audio_server.cpp
@@ -1120,7 +1120,7 @@ float AudioServer::get_playback_speed_scale() const {
 	return playback_speed_scale;
 }
 
-void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, StringName p_bus, Vector<AudioFrame> p_volume_db_vector, float p_start_time, float p_pitch_scale) {
+void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, const StringName &p_bus, Vector<AudioFrame> p_volume_db_vector, float p_start_time, float p_pitch_scale) {
 	ERR_FAIL_COND(p_playback.is_null());
 
 	HashMap<StringName, Vector<AudioFrame>> map;
@@ -1129,7 +1129,7 @@ void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, Str
 	start_playback_stream(p_playback, map, p_start_time, p_pitch_scale);
 }
 
-void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, HashMap<StringName, Vector<AudioFrame>> p_bus_volumes, float p_start_time, float p_pitch_scale, float p_highshelf_gain, float p_attenuation_cutoff_hz) {
+void AudioServer::start_playback_stream(Ref<AudioStreamPlayback> p_playback, const HashMap<StringName, Vector<AudioFrame>> &p_bus_volumes, float p_start_time, float p_pitch_scale, float p_highshelf_gain, float p_attenuation_cutoff_hz) {
 	ERR_FAIL_COND(p_playback.is_null());
 
 	AudioStreamPlaybackListNode *playback_node = new AudioStreamPlaybackListNode();
@@ -1188,7 +1188,7 @@ void AudioServer::stop_playback_stream(Ref<AudioStreamPlayback> p_playback) {
 	} while (!playback_node->state.compare_exchange_strong(old_state, new_state));
 }
 
-void AudioServer::set_playback_bus_exclusive(Ref<AudioStreamPlayback> p_playback, StringName p_bus, Vector<AudioFrame> p_volumes) {
+void AudioServer::set_playback_bus_exclusive(Ref<AudioStreamPlayback> p_playback, const StringName &p_bus, Vector<AudioFrame> p_volumes) {
 	ERR_FAIL_COND(p_volumes.size() != MAX_CHANNELS_PER_BUS);
 
 	HashMap<StringName, Vector<AudioFrame>> map;
@@ -1197,7 +1197,7 @@ void AudioServer::set_playback_bus_exclusive(Ref<AudioStreamPlayback> p_playback
 	set_playback_bus_volumes_linear(p_playback, map);
 }
 
-void AudioServer::set_playback_bus_volumes_linear(Ref<AudioStreamPlayback> p_playback, HashMap<StringName, Vector<AudioFrame>> p_bus_volumes) {
+void AudioServer::set_playback_bus_volumes_linear(Ref<AudioStreamPlayback> p_playback, const HashMap<StringName, Vector<AudioFrame>> &p_bus_volumes) {
 	ERR_FAIL_COND(p_bus_volumes.size() > MAX_BUSES_PER_PLAYBACK);
 
 	AudioStreamPlaybackListNode *playback_node = _find_playback_list_node(p_playback);
diff --git a/servers/audio_server.h b/servers/audio_server.h
index 9ffa95bc00e..4606299c477 100644
--- a/servers/audio_server.h
+++ b/servers/audio_server.h
@@ -372,13 +372,13 @@ public:
 	float get_playback_speed_scale() const;
 
 	// Convenience method.
-	void start_playback_stream(Ref<AudioStreamPlayback> p_playback, StringName p_bus, Vector<AudioFrame> p_volume_db_vector, float p_start_time = 0, float p_pitch_scale = 1);
+	void start_playback_stream(Ref<AudioStreamPlayback> p_playback, const StringName &p_bus, Vector<AudioFrame> p_volume_db_vector, float p_start_time = 0, float p_pitch_scale = 1);
 	// Expose all parameters.
-	void start_playback_stream(Ref<AudioStreamPlayback> p_playback, HashMap<StringName, Vector<AudioFrame>> p_bus_volumes, float p_start_time = 0, float p_pitch_scale = 1, float p_highshelf_gain = 0, float p_attenuation_cutoff_hz = 0);
+	void start_playback_stream(Ref<AudioStreamPlayback> p_playback, const HashMap<StringName, Vector<AudioFrame>> &p_bus_volumes, float p_start_time = 0, float p_pitch_scale = 1, float p_highshelf_gain = 0, float p_attenuation_cutoff_hz = 0);
 	void stop_playback_stream(Ref<AudioStreamPlayback> p_playback);
 
-	void set_playback_bus_exclusive(Ref<AudioStreamPlayback> p_playback, StringName p_bus, Vector<AudioFrame> p_volumes);
-	void set_playback_bus_volumes_linear(Ref<AudioStreamPlayback> p_playback, HashMap<StringName, Vector<AudioFrame>> p_bus_volumes);
+	void set_playback_bus_exclusive(Ref<AudioStreamPlayback> p_playback, const StringName &p_bus, Vector<AudioFrame> p_volumes);
+	void set_playback_bus_volumes_linear(Ref<AudioStreamPlayback> p_playback, const HashMap<StringName, Vector<AudioFrame>> &p_bus_volumes);
 	void set_playback_all_bus_volumes_linear(Ref<AudioStreamPlayback> p_playback, Vector<AudioFrame> p_volumes);
 	void set_playback_pitch_scale(Ref<AudioStreamPlayback> p_playback, float p_pitch_scale);
 	void set_playback_paused(Ref<AudioStreamPlayback> p_playback, bool p_paused);
diff --git a/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.cpp b/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.cpp
index 6a99eb41089..e77a2e95679 100644
--- a/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.cpp
+++ b/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.cpp
@@ -330,7 +330,7 @@ RID RenderSceneBuffersRD::create_texture_from_format(const StringName &p_context
 	return named_texture.texture;
 }
 
-RID RenderSceneBuffersRD::_create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName p_view_name, const Ref<RDTextureView> p_view) {
+RID RenderSceneBuffersRD::_create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName &p_view_name, const Ref<RDTextureView> p_view) {
 	RD::TextureView texture_view;
 	if (p_view.is_valid()) { // only use when supplied, else default.
 		texture_view = p_view->base;
@@ -339,7 +339,7 @@ RID RenderSceneBuffersRD::_create_texture_view(const StringName &p_context, cons
 	return create_texture_view(p_context, p_texture_name, p_view_name, texture_view);
 }
 
-RID RenderSceneBuffersRD::create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName p_view_name, RD::TextureView p_view) {
+RID RenderSceneBuffersRD::create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName &p_view_name, RD::TextureView p_view) {
 	NTKey view_key(p_context, p_view_name);
 
 	// check if this is a known texture
diff --git a/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.h b/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.h
index b2946e6bbcb..5b8a74de833 100644
--- a/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.h
+++ b/servers/rendering/renderer_rd/storage_rd/render_scene_buffers_rd.h
@@ -106,7 +106,7 @@ private:
 		}
 
 		NTKey() {}
-		NTKey(const StringName p_context, const StringName p_texture_name) {
+		NTKey(const StringName &p_context, const StringName &p_texture_name) {
 			context = p_context;
 			buffer_name = p_texture_name;
 		}
@@ -196,7 +196,7 @@ public:
 	bool has_texture(const StringName &p_context, const StringName &p_texture_name) const;
 	RID create_texture(const StringName &p_context, const StringName &p_texture_name, const RD::DataFormat p_data_format, const uint32_t p_usage_bits, const RD::TextureSamples p_texture_samples = RD::TEXTURE_SAMPLES_1, const Size2i p_size = Size2i(0, 0), const uint32_t p_layers = 0, const uint32_t p_mipmaps = 1, bool p_unique = true);
 	RID create_texture_from_format(const StringName &p_context, const StringName &p_texture_name, const RD::TextureFormat &p_texture_format, RD::TextureView p_view = RD::TextureView(), bool p_unique = true);
-	RID create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName p_view_name, RD::TextureView p_view = RD::TextureView());
+	RID create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName &p_view_name, RD::TextureView p_view = RD::TextureView());
 	RID get_texture(const StringName &p_context, const StringName &p_texture_name) const;
 	const RD::TextureFormat get_texture_format(const StringName &p_context, const StringName &p_texture_name) const;
 	RID get_texture_slice(const StringName &p_context, const StringName &p_texture_name, const uint32_t p_layer, const uint32_t p_mipmap, const uint32_t p_layers = 1, const uint32_t p_mipmaps = 1);
@@ -310,7 +310,7 @@ public:
 
 private:
 	RID _create_texture_from_format(const StringName &p_context, const StringName &p_texture_name, const Ref<RDTextureFormat> &p_texture_format, const Ref<RDTextureView> &p_view = Ref<RDTextureView>(), bool p_unique = true);
-	RID _create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName p_view_name, const Ref<RDTextureView> p_view = Ref<RDTextureView>());
+	RID _create_texture_view(const StringName &p_context, const StringName &p_texture_name, const StringName &p_view_name, const Ref<RDTextureView> p_view = Ref<RDTextureView>());
 	Ref<RDTextureFormat> _get_texture_format(const StringName &p_context, const StringName &p_texture_name) const;
 	RID _get_texture_slice_view(const StringName &p_context, const StringName &p_texture_name, const uint32_t p_layer, const uint32_t p_mipmap, const uint32_t p_layers = 1, const uint32_t p_mipmaps = 1, const Ref<RDTextureView> p_view = Ref<RDTextureView>());
 
diff --git a/servers/rendering/shader_language.cpp b/servers/rendering/shader_language.cpp
index a2da26eb65e..fef1a205d61 100644
--- a/servers/rendering/shader_language.cpp
+++ b/servers/rendering/shader_language.cpp
@@ -4665,7 +4665,7 @@ bool ShaderLanguage::_validate_assign(Node *p_node, const FunctionInfo &p_functi
 	return false;
 }
 
-bool ShaderLanguage::_propagate_function_call_sampler_uniform_settings(StringName p_name, int p_argument, TextureFilter p_filter, TextureRepeat p_repeat) {
+bool ShaderLanguage::_propagate_function_call_sampler_uniform_settings(const StringName &p_name, int p_argument, TextureFilter p_filter, TextureRepeat p_repeat) {
 	for (int i = 0; i < shader->vfunctions.size(); i++) {
 		if (shader->vfunctions[i].name == p_name) {
 			ERR_FAIL_INDEX_V(p_argument, shader->vfunctions[i].function->arguments.size(), false);
@@ -4699,7 +4699,7 @@ bool ShaderLanguage::_propagate_function_call_sampler_uniform_settings(StringNam
 	ERR_FAIL_V(false); //bug? function not found
 }
 
-bool ShaderLanguage::_propagate_function_call_sampler_builtin_reference(StringName p_name, int p_argument, const StringName &p_builtin) {
+bool ShaderLanguage::_propagate_function_call_sampler_builtin_reference(const StringName &p_name, int p_argument, const StringName &p_builtin) {
 	for (int i = 0; i < shader->vfunctions.size(); i++) {
 		if (shader->vfunctions[i].name == p_name) {
 			ERR_FAIL_INDEX_V(p_argument, shader->vfunctions[i].function->arguments.size(), false);
diff --git a/servers/rendering/shader_language.h b/servers/rendering/shader_language.h
index c707f6aad7c..737545b8caf 100644
--- a/servers/rendering/shader_language.h
+++ b/servers/rendering/shader_language.h
@@ -1092,8 +1092,8 @@ private:
 
 	bool _validate_function_call(BlockNode *p_block, const FunctionInfo &p_function_info, OperatorNode *p_func, DataType *r_ret_type, StringName *r_ret_type_str, bool *r_is_custom_function = nullptr);
 	bool _parse_function_arguments(BlockNode *p_block, const FunctionInfo &p_function_info, OperatorNode *p_func, int *r_complete_arg = nullptr);
-	bool _propagate_function_call_sampler_uniform_settings(StringName p_name, int p_argument, TextureFilter p_filter, TextureRepeat p_repeat);
-	bool _propagate_function_call_sampler_builtin_reference(StringName p_name, int p_argument, const StringName &p_builtin);
+	bool _propagate_function_call_sampler_uniform_settings(const StringName &p_name, int p_argument, TextureFilter p_filter, TextureRepeat p_repeat);
+	bool _propagate_function_call_sampler_builtin_reference(const StringName &p_name, int p_argument, const StringName &p_builtin);
 	bool _validate_varying_assign(ShaderNode::Varying &p_varying, String *r_message);
 	bool _check_node_constness(const Node *p_node) const;