[johnjr]

I just wrote a post about how the Cpython is much faster without GIL:https://news.ycombinator.com/item?id=40988244

[arp242]

I mean, only the threaded version, which is expected. For tons of cases Python without the GIL is not just slower, but significantly slower; "somewhere from 30-50%" according to one of the people working on this: https://news.ycombinator.com/item?id=40949628

All of this is why the GIL wasn't removed 20 years ago. There are real trade-offs here.

[rbenchmark]

30-50% is an understatement. The latest beta is more than 100% slower in a simple benchmark:

https://news.ycombinator.com/item?id=41019626

[BossingAround]

How is single-threaded code slower without GIL?