AMD Catalyst vs. Linux 3.7 + Mesa 9.1-devel Gallium3D Performance
Urban Terror has seen some improvements with the latest Git code that finally lift it to around 50% the speed of the Catalyst driver for the Radeon HD 5000/6000 series graphics cards.
There are some performance improvements to be found in the newest Radeon Git code for the VDrift racing game. Unfortunately, though, the open-source drivers still render some of the GL shaders incorrectly so its performance wasn't compared to Catalyst.
Warsow experienced some very significant performance boosts on the mid and high-end Radeon HD 5000/6000 series graphics cards that were benchmarked.