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You're conflating concurrency with parallelism.

Your 20000 concurrent connections with asyncio are not parallel. You can have 20000 threads if you want.

Are you sure about that? Have you ever tried starting 20,000 threads? Try it.

The connections are actually handled by the OS in parallel, it's the callbacks to Python that are not. Why do you need a whole OS thread to handle sending a SYN/ACK?

As you well know 20000 threads is not a great way to do anything. Especially in Python.

I agree that threads in Python are not great but 20000 threads is otherwise not an issue.

Are you serious? Have you ever tried starting 20k threads?

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