### 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)

Mesh *mesh = mesh_owner.get_or_null(p_mesh);
	ERR_FAIL_NULL_V(mesh, AABB());
	if (mesh->custom_aabb != AABB()) {
		return mesh->custom_aabb;
	}
	Skeleton *skeleton = skeleton_owner.get_or_null(p_skeleton);
	if (!skeleton || skeleton->size == 0 || mesh->skeleton_aabb_version == skeleton->version) {
		return mesh->aabb;
	}
	
	AABB aabb;
	for (uint32_t i = 0; i < mesh->surface_count; i++) {
		AABB laabb;
		if ((mesh->surfaces[i]->format & RS::ARRAY_FORMAT_BONES) && mesh->surfaces[i]->bone_aabbs.size()) {
			int bs = mesh->surfaces[i]->bone_aabbs.size();
			const AABB *skbones = mesh->surfaces[i]->bone_aabbs.ptr();
			int sbs = skeleton->size;
			ERR_CONTINUE(bs > sbs);
			const float *baseptr = skeleton->data.ptr();
			bool first = true;
			if (skeleton->use_2d) {
				for (int j = 0; j < bs; j++) {
					if (skbones[j].size == Vector3(-1, -1, -1)) {
						continue; 
					}
					const float *dataptr = baseptr + j * 8;