That's because they are animating top and left instead of using CSS3's translate, so they aren't getting nice smooth hardware acceleration.

Speed aside, displaying the movie covers/posters behind all those triangles is weird. I imagine when there's a fence on the cover itself it could make for a cool interference effect but otherwise it just seems like every movie is set in prison .

Works well for me. OS X 10.6.8, Chrome 19.0.1061.0