If you follow these GhPython performance tips, things appear to compute quite a bit faster (i.e. it’s not just the rendering that’s expensive, but the implicit looping plus use of type hints). Also, if you join all the meshes into one that can make the viewport performance drastically faster:
240822_SlowMonochormeMeshRender_00.gh (17.2 KB)
Edit: Just replying here to your post over here 