Comment 141 for bug 190754

might this be related to Xorg? in conjunction with other bugs / "de-optimizations" here and elsewhere?
I find it very demanding, lately..
scrolling firefox, openoffice, thunderbird, skype, switching tabs, minimizing, maximizing, etc.. peaks Xorg to exaggerated CPU-usage... it got better in average, dropouts of sound became rare, but i find it altogether worse than under gutsy on slower laptop.