[mvolfik]

what is the benefit of threadpool though? am I understanding it correctly that due to GIL, python will just keep switching the threads, so instead of running A then B both at 100% speed, both will run concurrently at 50% speed (+/- overhead)?

[vgel]

Only if you're CPU bound, but usually your webserver is blocking on disk IO or database calls or whatever, not calculating stuff, in which case the GIL doesn't matter.

[playing_colours]

You can get benefits with IO bound work.