Lately I'm experiencing a terrible 2D performance in VirtualBox and some other things (for example, the videos in NBA.com). Everything is unbearably choppy and the CPU usage is 100% in one core. These things used to work great not long ago, but even if I downgrade mesa (the usual suspect) to 7.7 I still get a bad performance. So before I start downgrading other packages (in gentoo it's a PITA) I'd like to know if someone else experienced this.
I'm using the latest git radeon and mesa, libdrm-2.4.17, xorg-server-126.96.36.1992, kernel 2.6.32. This is with a rv670 card.
Doh, nevermind my VirtualBox problems, I've discovered the bad performance was caused by enabling nested paging . So the only problem seems to be some flash videos, and we all know how well flash works in linux. Nothing to see here.