### 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)

newptr[0] = Math::half_to_float(raw_data[0]);
				newptr[1] = Math::half_to_float(raw_data[1]);
				newptr[2] = Math::half_to_float(raw_data[2]);
				newptr[3] = Math::half_to_float(raw_data[3]);
			}
		}
		return decompressed;
	} else {
		return ret;
	}
}
void MeshStorage::multimesh_set_visible_instances(RID p_multimesh, int p_visible) {
	MultiMesh *multimesh = multimesh_owner.get_or_null(p_multimesh);
	ERR_FAIL_NULL(multimesh);
	ERR_FAIL_COND(p_visible < -1 || p_visible > multimesh->instances);
	if (multimesh->visible_instances == p_visible) {
		return;
	}
	if (multimesh->data_cache.size()) {
		
		_multimesh_mark_all_dirty(multimesh, false, true);
		int start = multimesh->visible_instances >= 0 ? multimesh->visible_instances : multimesh->instances;
		for (int i = start; i < p_visible; i++) {
			_multimesh_mark_dirty(multimesh, i, true);
		}
	}
	multimesh->visible_instances = p_visible;
	multimesh->dependency.changed_notify(Dependency::DEPENDENCY_CHANGED_MULTIMESH_VISIBLE_INSTANCES);
}
int MeshStorage::multimesh_get_visible_instances(RID p_multimesh) const {