It's just about what kind of code you write. If you write a lot of code that parallelizes over data you will hurt all the time because of the GIL. If you have

It's just about what kind of code you write. If you write a lot of code that parallelizes over data you will hurt all the time because of the GIL. If you have worker processes that do something on the CPU, and the results need to be collected and processed further in some other process, you now need to pickle the data to copy it around. That can get really slow. I understand a lot of python users don't do that kind of thing, but it's a real problem. I'm happy that the python community seems to be slowly beginning to take this seriously after decades of just claiming the GIL isn't a real issue.