### 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)

} break;
		case RS::GLOBAL_VAR_TYPE_UVEC2: {
			GlobalShaderUniforms::ValueUInt &bv = *(GlobalShaderUniforms::ValueUInt *)&global_shader_uniforms.buffer_values[p_index];
			Vector2i v = convert_to_vector<Vector2i>(p_value);
			bv.x = v.x;
			bv.y = v.y;
			bv.z = 0;
			bv.w = 0;
		} break;
		case RS::GLOBAL_VAR_TYPE_UVEC3: {
			GlobalShaderUniforms::ValueUInt &bv = *(GlobalShaderUniforms::ValueUInt *)&global_shader_uniforms.buffer_values[p_index];
			Vector3i v = convert_to_vector<Vector3i>(p_value);
			bv.x = v.x;
			bv.y = v.y;
			bv.z = v.z;
			bv.w = 0;
		} break;
		case RS::GLOBAL_VAR_TYPE_UVEC4: {
			GlobalShaderUniforms::ValueUInt &bv = *(GlobalShaderUniforms::ValueUInt *)&global_shader_uniforms.buffer_values[p_index];
			Vector4i v = convert_to_vector<Vector4i>(p_value);
			bv.x = v.x;
			bv.y = v.y;
			bv.z = v.z;
			bv.w = v.w;
		} break;
		case RS::GLOBAL_VAR_TYPE_FLOAT: {
			GlobalShaderUniforms::Value &bv = global_shader_uniforms.buffer_values[p_index];
			float v = p_value;
			bv.x = v;
			bv.y = 0;