### 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 RS::ARRAY_COLOR: {
						attrib_stride += sizeof(uint32_t);
					} break;
					case RS::ARRAY_TEX_UV: {
						if (p_surface.format & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES) {
							attrib_stride += sizeof(uint16_t) * 2;
						} else {
							attrib_stride += sizeof(float) * 2;
						}
					} break;
					case RS::ARRAY_TEX_UV2: {
						if (p_surface.format & RS::ARRAY_FLAG_COMPRESS_ATTRIBUTES) {
							attrib_stride += sizeof(uint16_t) * 2;
						} else {
							attrib_stride += sizeof(float) * 2;
						}
					} break;
					case RS::ARRAY_CUSTOM0:
					case RS::ARRAY_CUSTOM1:
					case RS::ARRAY_CUSTOM2:
					case RS::ARRAY_CUSTOM3: {
						int idx = i - RS::ARRAY_CUSTOM0;
						uint32_t fmt_shift[RS::ARRAY_CUSTOM_COUNT] = { RS::ARRAY_FORMAT_CUSTOM0_SHIFT, RS::ARRAY_FORMAT_CUSTOM1_SHIFT, RS::ARRAY_FORMAT_CUSTOM2_SHIFT, RS::ARRAY_FORMAT_CUSTOM3_SHIFT };
						uint32_t fmt = (p_surface.format >> fmt_shift[idx]) & RS::ARRAY_FORMAT_CUSTOM_MASK;
						uint32_t fmtsize[RS::ARRAY_CUSTOM_MAX] = { 4, 4, 4, 8, 4, 8, 12, 16 };
						attrib_stride += fmtsize[fmt];
					} break;
					case RS::ARRAY_WEIGHTS:
					case RS::ARRAY_BONES: {