Slow firefox on KDE with free ati drivers

view story

https://bbs.archlinux.org – Hello arch users,I'm using since very recently free ati drivers. Thy are quite good, and dont have much problems.I just have one which is very annoying. Firefox is slow when scrolling.Terribly slow. Whereas Chromium is fast as usual. But i dont want to use chromium ! So i'm asking some help so that i can continue to use firefox...I'm using KDE, ati-dri drivers with KMS enabled and Firefox 15.My graphiccard config is :Section "Device" Identifier "My Graphics Card" Driver "radeon" Option "MigrationHeuristic" &quot (HowTos)