alt Hacker NewsIn production what's making your application slow is extremely unlikely to be the python code. It's going to be I/O, the threading/concurrency architecture, other mistakes or inefficiency that can be cleared up without leaving the ecosystem. The question of fast vs. slow languages doesn't make a lot of sense to entertain before you have any context of the specific needs of the application or use case. On its own it's just unsophisticated vanity blog fodder.
With the obvious caveat that low-level game engine, image/video processing, numerical code etc. isn't really viable in Python. But outside of that, it's fast enough for gluing together other code that's doing the heavy lifting.