There is a common dev story in python:
Hrmm this is running slow, maybie I can use threads to make it go faster. Weird, not faster, discovers GIL. Maybe I can use multiprocessing. Hrmm this sucks I have to use IPC and serialize things to pass them. Hrmm faster but still weirdly slow. Proceeds to spend a ton of time optimizing IPC and figuring how to get code in multiple processes to communicate.
There is a common dev story in python: Hrmm this is running slow, maybie I can use threads to make it go faster. Weird, not faster, discovers GIL. Maybe I can use multiprocessing. Hrmm this sucks I have to use IPC and serialize things to pass them. Hrmm faster but still weirdly slow. Proceeds to spend a ton of time optimizing IPC and figuring how to get code in multiple processes to communicate.