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> runs on a single box via a single racket process

Incomplete. They are fronted by one of the largest CDNs in the world, on whom they rely for most traffic.

Well, I actually don't know the numbers, but I do know that for popular posts HN admins (a) try to break the conversation up over multiple posts and (b) plead with users to log out so as to allow Cloudflare to handle the load.

The biggest lesson HN teaches for designing large scale systems is "use a large scale system someone else has already designed".

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