I'm running an HD 5870 and getting some pretty terrible performance. I'm running the proprietary driver that Ubuntu allows you to install from the system settings. I tried downloading the latest driver from the amd site and installing them following this guide: BinaryDriverHowto/ATI - Community Ubuntu Documentation (section 3.1) This resulted in Unity not loading and I had to reinstall the drivers that are in the Ubuntu repositories. Any idea what I should do?
I turned off AA completely in the game and the helped a lot. There is still a hiccup every second or two that is really annoying. It doesn't seem to be affected by what is being rendered.. it happens weather I'm looking at a wall or 20 players shooting at each other.