### 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 (changed) {
		update();
	} else {
		_update_node_list();
	}
	return selected_node_list;
}
List<Node *> EditorSelection::get_full_selected_node_list() {
	List<Node *> node_list;
	for (const KeyValue<Node *, Object *> &E : selection) {
		node_list.push_back(E.key);
	}
	return node_list;
}
void EditorSelection::clear() {
	while (!selection.is_empty()) {
		remove_node(selection.begin()->key);
	}
	changed = true;
	node_list_changed = true;
}
void EditorSelection::cancel_update() {
	changed = false;
}
EditorSelection::EditorSelection() {
}
EditorSelection::~EditorSelection() {
	clear();
}