### Godot version

Godot 4.1-beta2

### System information

Manjaro Gnome, Intel Core i7-11800H

### Issue description

On a relatively modern laptop (Intel Core i7-11800H), in a scene with many scripted nodes (total of 900+ with roughly half of them scripted), adding or duplicating a node freezes the editor for several seconds. Godot 4.0.2 handles such scenes much better!

Here is a flame graph captured while repeatedly duplicating simple Marker2D nodes with Ctrl+D in a complicated scene:
![Screenshot from 2023-06-15 23-54-38](https://github.com/godotengine/godot/assets/2766569/d0019f17-9b82-4a26-9b47-71fa7a3bef3a)

Performance data file to use with hotspot v1.4.1 (relevant data starts at the 75-second mark and lasts about 20+ seconds):
[perf.data.perfparser.zip](https://github.com/godotengine/godot/files/11763700/perf.data.perfparser.zip)



### Steps to reproduce

1) Add 1000 nodes with a script attached.
2) Duplicate a node and witness lags.

Also affects scrolling the scene tree dock.

### Minimal reproduction project

[add_node_lags_repro.zip](https://github.com/godotengine/godot/files/11763731/add_node_lags_repro.zip)

script_class_clear_icon_paths();
#ifndef DISABLE_DEPRECATED
	if (ProjectSettings::get_singleton()->has_setting("_global_script_class_icons")) {
		Dictionary d = GLOBAL_GET("_global_script_class_icons");
		List<Variant> keys;
		d.get_key_list(&keys);
		for (const Variant &E : keys) {
			String name = E.operator String();
			_script_class_icon_paths[name] = d[name];
			String path = ScriptServer::get_global_class_path(name);
			script_class_set_name(path, name);
		}
		ProjectSettings::get_singleton()->clear("_global_script_class_icons");
	}
#endif
	Array script_classes = ProjectSettings::get_singleton()->get_global_class_list();
	for (int i = 0; i < script_classes.size(); i++) {
		Dictionary d = script_classes[i];
		if (!d.has("class") || !d.has("path") || !d.has("icon")) {
			continue;
		}
		String name = d["class"];
		_script_class_icon_paths[name] = d["icon"];
		script_class_set_name(d["path"], name);
	}
}
Ref<Texture2D> EditorData::extension_class_get_icon(const String &p_class) const {