### Godot version

v4.2.beta1.official [b1371806a]

### System information

Ubuntu 22.04.3 LTS 22.04 - X11 - GLES3 (Compatibility) - AMD Radeon RX 560 Series (polaris11, LLVM 15.0.7, DRM 3.42, 5.15.0-88-generic) () - AMD Ryzen 3 1200 Quad-Core Processor (4 Threads)

### Issue description

![image](https://github.com/godotengine/godot/assets/1330325/7a986599-5a68-42a4-beb1-5d3b4bf7db6b)
![image](https://github.com/godotengine/godot/assets/1330325/e8b8546b-b47b-4add-9567-7f70709ab03c)

Culling 3D goes bellow 60 fps even with just about 50 simple animated models. With v4.2.dev6.official [57a6813bb] many more models can be spawned without fps drop. However, both versions do show high cpu usage for culling 3D. Without animations there's barely any usage.

### Steps to reproduce

Spawn models with animation with the Compatibility renderer.

### Minimal reproduction project

[CullMRP.zip](https://github.com/godotengine/godot/files/13400514/CullMRP.zip)

mi->skeleton_version = sk->version;
		}
		dirty_mesh_instance_arrays.remove(&mi->array_update_list);
	}
	glDisable(GL_RASTERIZER_DISCARD);
	glBindBuffer(GL_ARRAY_BUFFER, 0);
	glBindBufferBase(GL_TRANSFORM_FEEDBACK_BUFFER, 0, 0);
}
RID MeshStorage::multimesh_allocate() {
	return multimesh_owner.allocate_rid();
}
void MeshStorage::multimesh_initialize(RID p_rid) {
	multimesh_owner.initialize_rid(p_rid, MultiMesh());
}
void MeshStorage::multimesh_free(RID p_rid) {
	_update_dirty_multimeshes();
	multimesh_allocate_data(p_rid, 0, RS::MULTIMESH_TRANSFORM_2D);
	MultiMesh *multimesh = multimesh_owner.get_or_null(p_rid);
	multimesh->dependency.deleted_notify(p_rid);
	multimesh_owner.free(p_rid);
}
void MeshStorage::multimesh_allocate_data(RID p_multimesh, int p_instances, RS::MultimeshTransformFormat p_transform_format, bool p_use_colors, bool p_use_custom_data) {
	MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
	ERR_FAIL_NULL(multimesh);
	if (multimesh->instances == p_instances && multimesh->xform_format == p_transform_format && multimesh->uses_colors == p_use_colors && multimesh->uses_custom_data == p_use_custom_data) {
		return;
	}
	if (multimesh->buffer) {
		GLES3::Utilities::get_singleton()->buffer_free_data(multimesh->buffer);
		multimesh->buffer = 0;