The results today are an updated look at the Ubuntu 13.04 Desktop Gaming Performance Comparison. There's much work ahead for Ubuntu 13.10 with new kernel/driver versions still ahead plus major updates to the packaged desktop environment options, but for those curious where things are at with the Ubuntu 13.10 development state as of 21 June, here's some benchmarks.
From the Core i7 4770K with Intel HD Graphics 4600, the Unity 7.0.0, Xfce 4.10, KDE 4.10.4, GNOME Shell 3.8.3, LXDE 0.5.12, Openbox 3.5.0, and Razor-Qt 0.5.2 desktop environments were tested when running a variety of OpenGL benchmarks. Each desktop was left in its stock/packaged configuration though for KDE's KWin the option to disable window effects on fullscreen windows was utilized.
The full system/hardware details, system logs, and results in full for this benchmarking can be found in 1306213-SO-DESKTOPLI17. Embedded below is just a preview.
KDE and GNOME Shell tended to be the slowest gaming desktops, but overall the results tend to be close with modern Linux OpenGL graphics drivers when comparing the different Linux desktop options. Be sure to see the full results on OpenBenchmarking.org. A more thorough comparison with various graphics drivers will come when the next round of major desktop stable versions are released plus the Ubuntu 13.10 stable release on approach.