I very much love the TR-808 drum synth sound, but I can't use this ... it's too slow! What's it doing? I'm not even sure if these beats are supposed to sound o

I very much love the TR-808 drum synth sound, but I can't use this ... it's too slow! What's it doing? I'm not even sure if these beats are supposed to sound out of sync because I clicked something wrong, or because the whole thing is running at 3fps. I just wish I could play with this thing! This is an early 80s drum machine people, it should run on a 3 year old laptop, right? (using Firefox 29, Chromium doesn't even display the cube)