Looks good (the extension). Any other good tiling extensions with keyboard and GUI support? I would like to explore a few to see which one works well for me

Tokio has support for multiple threaded async in rust. As for micro controller, I don’t think you can have multiple threads in flight anyways, so that’s the best you’ll get

Which language? Usually there’s a thread pool where multiple tasks are run in parallel. CPython is a special case due to gil, but we have pypy which has actual parallelism