### 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)

mtx.basis.rows[2][0] = dataptr[8];
					mtx.basis.rows[2][1] = dataptr[9];
					mtx.basis.rows[2][2] = dataptr[10];
					mtx.origin.z = dataptr[11];
					AABB baabb = mtx.xform(skbones[j]);
					if (first) {
						laabb = baabb;
						first = false;
					} else {
						laabb.merge_with(baabb);
					}
				}
			}
			if (laabb.size == Vector3()) {
				laabb = mesh->surfaces[i]->aabb;
			}
		} else {
			laabb = mesh->surfaces[i]->aabb;
		}
		if (i == 0) {
			aabb = laabb;
		} else {
			aabb.merge_with(laabb);
		}
	}
	mesh->aabb = aabb;
	mesh->skeleton_aabb_version = skeleton->version;
	return aabb;
}
void MeshStorage::mesh_set_shadow_mesh(RID p_mesh, RID p_shadow_mesh) {