So I have this simple slide transition on a site. I have the site set to 31fps, and the transition takes 30, but its super chunk, but only in IE on a PC. all other browsers seem to do fine with it (Firefox on both mac & PC, and safari).

I used to have a wmode transparent, but I removed it to see if that helped it run better, it didnt.

Any thoughts on why or what to do?

http://proofs.factor1studios.com/ymm/