### 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)

if (_script_icon_cache.has(p_script) && _script_icon_cache[p_script].is_valid()) {
		return _script_icon_cache[p_script];
	}
	Ref<Script> base_scr = p_script;
	while (base_scr.is_valid()) {
		
		StringName class_name = script_class_get_name(base_scr->get_path());
		String icon_path = script_class_get_icon_path(class_name);
		Ref<Texture2D> icon = _load_script_icon(icon_path);
		if (icon.is_valid()) {
			_script_icon_cache[p_script] = icon;
			return icon;
		}
		
		
		const EditorData::CustomType *ctype = get_custom_type_by_path(base_scr->get_path());
		if (ctype && ctype->icon.is_valid()) {
			_script_icon_cache[p_script] = ctype->icon;
			return ctype->icon;
		}
		
		base_scr = base_scr->get_base_script();
	}
	
	_script_icon_cache[p_script] = Ref<Texture>();
	return nullptr;
}
void EditorData::clear_script_icon_cache() {