Our WordPress site is very slow in IE9. But when I browse it with Google Chrome it is very fast.
Strange thing is that the back-end (admin panel) is working fast in IE9 and Chrome.
The problem is only on the front-end.
We use no plugins. We only integrated a custom search engine. But before updating to WordPress 3.3.2 it worked very fast in IE9 also.
It seems that the update to 3.3.2 broke something.