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> The real win isn't spawning a massive number of threads, but automatically yielding on network I/O

This is of course what normal OS threads do as well, they get suspended when blocking on IO. Which is why 100k OS threads doing IO works fine too.

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Yes. What I was trying to imply is that now there is a lightweight processing unit that still is able to suspend on IO (independently and without involvement from the OS scheduler), but can do that without relying on async/reactive patterns on code level. This required significant changes to the standard lib and runtime.

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