Finished the first iteration of the Rust backend, passed some tests, and linked it to the UI. It definitely works, for the signature GoL patterns (blocks, loaves, gliders, etc.) are emerging, but the system is still quite unable to handle the 1000x1000 grid I had hoped for. The bottleneck may simply be the PyO3 interface, or (very likely) there may be much room for optimization in my Rust code.