I have Windows 7 RTM and NVIDIA GeForce 8600GTS. When I tried to run Nexuiz yesterday on my machine without turning off Aero I experienced poor graphic performance even on the lowest settings. When I disabled Aero everything started to run smoothly.
Many games automatically switch to Aero basic (de-facto no Aero) which doesn't use composition and other eyecandy things. Some do it because of incompatibility and some because of performance issues. Why not to implement such option in Nexuiz?