Explorer slow with jquery animation. Other browser works well

Hi everyone I have a compatibility problem with a simple jquery plugin i've done for making an animated menu; You can find the full site here:

Main site

My Library

the "bootstrap" file

The problem is: the red rectangle animate well throught firefox, opera, chrome...etc. I've only problem with explorer. It seems that the script works well, but the animation 开发者_StackOverflowis scattered and very very slow....any idea?

I'm sorry for not having put code sample here, but i definetly don't know where look for the problem.

Thank you guys

Edit: I've found out that the problem was the big image i've temporary put in the page. Now I removed it and everythings works well. I cannot understand it, but that's all folks :)

It could be that there's no bug you can fix here.

Well, let's face it, IE (lt 9 at least) sucks if it comes to javascript performance. You could try to optimize your scripts further, but I wouldn't expect a miracle to happen.

Another option could be to use another PlugIn, with which IE8 might perform better.