Firefox slows down when opening a site with animated gifs

After updating to FF4, I find that whenever I try to open a page that has multiple animated gifs on it, firefox slows down tremendously. CPU usage goes up to 50-75% and all animated gifs are moving really slow.
It's not only large animated gifs, but it also occurs on forums that have animated smilies. I never had this problem in FF 3.6 nor any other browser (IE, Chrome, Safari). If I start FF4.0 without any add-ons or plugins it does the same thing. Even with a fresh install. Does anyone have a solution to his problem? Since I can't use some of my favorite sites now with FF, without my pc slowing everything down.

Disabling the hardware acceleration worked for me!

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AdapterDeviceID: 0x 867
AdapterDriverVersion:
AdapterVendorID: 0x10de
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Firefox slows down when opening a site with animated gifs

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