> HN's app server runs on a single core, so we don't have a lot of performance to spare!

That's interesting. Is there any more information about HN's tech stack? I know it's built on top of the Lisp dialect Arc, but I wonder about the server specs and would be happy to be pointed at some resource.

Although I experienced HN being down, I guess the overall uptime and availability is pretty decent. Keep up the good work!