Concurrency and multiprocessing terminology is the worst. Trying to learn about it, it seems like every language is doing their own thing with their own set of terms and definitions.

My bad for not making it more clear: it refers to a lightweight process here (e.g. like Erlang), not an OS process. Merely spawning these is basically just an allocation (Inko doesn't use PIDs either), so about as fast as it gets.