Oibaf Keeps Making Ubuntu GPU Driver Upgrades Easy
With OpenArena the Mesa 10.1-devel performance is actually slower than using Mesa 9.2.1 from Ubuntu 13.10. Using Mesa Git isn't always a regression-free experience and some performance drops come because of greater GL functionality being implemented in Mesa.
Urban Terror is in a similar boat, with also using the ioquake3 engine.
When running Reaction there's a very nice performance improvement for the Radeon HD 4870 graphics card when using the Oibaf-packaged drivers.