It's actually the opposite. My current job is making a piece of code faster my predecessor tried to make faster using multiprocessing. I now try to pull stuff b

It's actually the opposite. My current job is making a piece of code faster my predecessor tried to make faster using multiprocessing. I now try to pull stuff back into a single process. The code for example loads a file from disk in a separate process to have the main process available for number crunching. The problem: This data is then sent to the main process and another copy is created which takes time. Doing the same with threads is way faster, since data i/o operations are releasing the gil anyways.