That's strange... what browser are you using? I'm running it on Chrome and I can't really tell a big difference between here and Pico-8's site.
It was in Chrome, I use it most of the time but I test it in Opera and it runs at normal speed :P maybe something to do with java?
Not really sure... but whenever I see Chrome acting weird for a while I kill it and make sure all its processes are dead before re-launching it.
