I haven't had this problem, but I did check the performance. It looks like most of the time the CPU is drawing numbers on the screen. Imagine if all the numbers you see on the page were updating as fast as the guide when you're watching one bar fill up.
For most people this won't be a big deal for this small game. I will try and avoid this in my next games, because I probably want more numbers on-screen. If you know anything about css, you can hide all the numbers you don't care about and it should go faster/cooler, but I can't really test it because my computer runs the game too fast to tell.
Sorry for the trouble. Thanks for the feedback!