It's right up there with Hacker News as the most lean, usable web interfaces that works on anything. The pages are only a few tens of kilobytes, taking only a few dozen packets to transmit. Even with thousands of hits per second, I'd expect the server run just fine on a 1st-gen Raspberry Pi. I wonder why Simon has been having so much trouble with it. Has open-source software become as bloated as commercial software?