### 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)

gui[0] = v.columns[0][0];
				gui[1] = v.columns[0][1];
				gui[2] = 0; 
				gui[3] = 0; 
				gui[4] = v.columns[1][0];
				gui[5] = v.columns[1][1];
				gui[6] = 0; 
				gui[7] = 0; 
			}
		} break;
		case ShaderLanguage::TYPE_MAT3: {
			float *gui = (float *)data;
			if (p_array_size > 0) {
				const PackedFloat32Array &a = convert_array_std140<Basis, float>(value);
				const Basis default_basis;
				const int s = a.size();
				for (int i = 0, j = 0; i < p_array_size * 9; i += 9, j += 12) {
					if (i + 8 < s) {
						gui[j] = a[i];
						gui[j + 1] = a[i + 1];
						gui[j + 2] = a[i + 2];
						gui[j + 3] = 0; 
						gui[j + 4] = a[i + 3];
						gui[j + 5] = a[i + 4];
						gui[j + 6] = a[i + 5];
						gui[j + 7] = 0; 
						gui[j + 8] = a[i + 6];
						gui[j + 9] = a[i + 7];
						gui[j + 10] = a[i + 8];