It's actually more of a hack to deal with malformed GIFs and goes directly against spec. To address GIFs where each frame has a 0 frame delay, most GIF decoders implement a minimum frame delay value.

See: http://nullsleep.tumblr.com/post/16524517190/animated-gif-mi...

Edit: This is what it looks like with all frame delays set to 2 centiseconds: http://i.imgur.com/24xpZEd.gif

On Chrome and Firefox, you should see it animate more quickly.