Mesa 10.5-devel Brings Some Intel Haswell HD Graphics Changes Over Mesa 10.3
The Team Fortress 2 performance was slightly lower on 10.5-devel than with 10.3 and from glancing during the testing process there wasn't any noticeable difference in the rendering process.
Unigine Tropics also came in slightly lower with Mesa 10.5-devel on this Core i7 4770K Haswell system.
Warsow also came in lower with the newer Mesa Git code than what's shipped by Ubuntu 14.10.
Xonotic, meanwhile, was edging slightly higher with the new Mesa code on the Intel Haswell HD Graphics.