You're not completely off. There might be issues with async/await overhead that would be solved by a JIT, but also if you're using asyncio, the first _sensible_ choice to make would be to swap out the default event loop with one actually explicitly designed to be performant, such as uvloop's one, because asyncio.SelectorEventLoop is designed to be straightforward, not fast.

There's also the major issue of backpressure handling, but that's a whole other story, and not unique to Python.

My major issue with the post I replied to is that there are a bunch of confounding issues that make the comparison given meaningless.