### 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)

case ShaderLanguage::TYPE_VEC2: {
			float *gui = (float *)data;
			if (p_array_size > 0) {
				const PackedFloat32Array &a = convert_array_std140<Vector2, float>(value);
				write_array_std140<Vector2>(a, gui, p_array_size, 4);
			} else {
				Vector2 v = convert_to_vector<Vector2>(value);
				gui[0] = v.x;
				gui[1] = v.y;
			}
		} break;
		case ShaderLanguage::TYPE_VEC3: {
			float *gui = (float *)data;
			if (p_array_size > 0) {
				const PackedFloat32Array &a = convert_array_std140<Vector3, float>(value);
				write_array_std140<Vector3>(a, gui, p_array_size, 4);
			} else {
				Vector3 v = convert_to_vector<Vector3>(value);
				gui[0] = v.x;
				gui[1] = v.y;
				gui[2] = v.z;
			}
		} break;
		case ShaderLanguage::TYPE_VEC4: {
			float *gui = (float *)data;
			if (p_array_size > 0) {
				const PackedFloat32Array &a = convert_array_std140<Vector4, float>(value);
				write_array_std140<Vector4>(a, gui, p_array_size, 4);
			} else {
				Vector4 v = convert_to_vector<Vector4>(value);