Ironically, the site seems to currently be hugged to death, so maybe they should consider using Cloudflare to deal with HN traffic?
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Before that, it was on a mediocre-even-at-the-time dedicated-cores VM. That caused performance problems... because its Internet "pipe" was straw-sized, it turned out. The server itself was fine.
Web server performance has regressed amazingly badly in the world of the Cloud. Even "serious" sites have decided the performance equivalent of shitty shared-host Web hosting is a great idea and that introducing all the problems of distributed computing at the architecture level will help their moderate-traffic site work better (LOL; LMFAO), so now they need Cloudflare and such just so their "scalable" solution doesn't fall over in a light breeze.