### 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)

MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
	ERR_FAIL_NULL(multimesh);
	ERR_FAIL_INDEX(p_index, multimesh->instances);
	ERR_FAIL_COND(multimesh->xform_format != RS::MULTIMESH_TRANSFORM_2D);
	_multimesh_make_local(multimesh);
	{
		float *w = multimesh->data_cache.ptrw();
		float *dataptr = w + p_index * multimesh->stride_cache;
		dataptr[0] = p_transform.columns[0][0];
		dataptr[1] = p_transform.columns[1][0];
		dataptr[2] = 0;
		dataptr[3] = p_transform.columns[2][0];
		dataptr[4] = p_transform.columns[0][1];
		dataptr[5] = p_transform.columns[1][1];
		dataptr[6] = 0;
		dataptr[7] = p_transform.columns[2][1];
	}
	_multimesh_mark_dirty(multimesh, p_index, true);
}
void MeshStorage::multimesh_instance_set_color(RID p_multimesh, int p_index, const Color &p_color) {