### 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)

if (mesh->blend_shape_count > 0) {
		mi->blend_weights.resize(mesh->blend_shape_count);
		for (uint32_t i = 0; i < mi->blend_weights.size(); i++) {
			mi->blend_weights[i] = 0.0;
		}
	}
	MeshInstance::Surface s;
	if ((mesh->blend_shape_count > 0 || (mesh->surfaces[p_surface]->format & RS::ARRAY_FORMAT_BONES)) && mesh->surfaces[p_surface]->vertex_buffer_size > 0) {
		
		s.format_cache = mesh->surfaces[p_surface]->format;
		if ((s.format_cache & (1ULL << RS::ARRAY_VERTEX))) {
			if (s.format_cache & RS::ARRAY_FLAG_USE_2D_VERTICES) {
				s.vertex_size_cache = 2;
			} else {
				s.vertex_size_cache = 3;