The title of the first slide in the video is "Heap allocations are expensive!" And using a pool the way I'm proposing does not fragment the heap. It might be

The title of the first slide in the video is "Heap allocations are expensive!" And using a pool the way I'm proposing does not fragment the heap. It might be slightly worse if you serially touch a lot of Meshes which have only a few vertices and edges each, but this is a corner case and a trade-off anyway.