Fedora 20 Through Fedora 23 Benchmarks
The performance of OpenArena didn't change much over the past two years for this Cayman GPU that's using Mesa's R600g driver, aside from a regression in Fedora 21.
With the Tesseract open-source game, there's a very noticeable improvement from Fedora 20 to Fedora 21 while since then it's been less changed.
Xonotic showed a performance improvement from Fedora 21 to Fedora 22, while if anything the performance for Fedora 23 is slightly regressed for this popular open-source first person shooter game.