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> One web request should not be served by one process at a time

It's doesn't have to be. You can use asyncio and deal with many requests at a time by one process.

> I love python, but it is not suitable for backend work at scale.

What's at scale ?

Most projects I work on IRL, including in banks and administrations, never reach the level of scale this even remotely a problem. Too many people think they are Google.

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Do you mean intranet bank apps? Or public facing sites?

It doesn't matter. In France, there are 70 millions people. Remove old and young ones, and the ones that are not clients in your bank. Then spread the usage on the week, then on 24h, divide by the number of requests that actually hit your Python backend (so no cache, no static files, etc). You got what ? 1000 requests/s top ? That's nothing.

Bank sites are not youtube.

Besides, operations on your bank account don't even hit the Python backend, but a dedicated system. Usually some COBOL dinosaure they froze, wrapped into a Java service and exposed through a RESTish API so that the rest of their system can use it without ever having to touch it again.

And if you were really wanting to get as much performance as you wanted out of python there's plenty of options like epoll...

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