Unity On XMir Performance For Nouveau Gallium3D
Running Unity 7 atop XMir with the latest development packages for Ubuntu 13.10 noticeably degrades the Nouveau Gallium3D graphics driver performance compared to running just an X.Org Server.
The CPU-limited OpenArena 0.8.5 game with a resolution of just 800x600 was the only exception of an OpenGL game running faster on XMir than on a traditional X.Org Server.