### 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)

GlobalShaderUniforms::Variable *gv = material_storage->global_shader_uniforms.variables.getptr(E.key);
			uint32_t index = 0;
			if (gv) {
				index = gv->buffer_index;
			} else {
				WARN_PRINT("Shader uses global parameter '" + E.key + "', but it was removed at some point. Material will not display correctly.");
			}
			uint32_t offset = p_uniform_offsets[E.value.order];
			uint32_t *intptr = (uint32_t *)&p_buffer[offset];
			*intptr = index;
			uses_global_buffer = true;
			continue;
		}
		
		uint32_t offset = p_uniform_offsets[E.value.order];
#ifdef DEBUG_ENABLED
		uint32_t size = 0U;
		
		if (E.value.array_size > 0) {
			size = ShaderLanguage::get_datatype_size(E.value.type) * E.value.array_size;
			int m = (16 * E.value.array_size);
			if ((size % m) != 0U) {
				size += m - (size % m);
			}
		} else {
			size = ShaderLanguage::get_datatype_size(E.value.type);
		}
		ERR_CONTINUE(offset + size > p_buffer_size);
#endif