etconfig

The r_depthbits sets the color depth to 16 or 32 bit.

Usage:
/seta r_depthbits 16
then do:
/vid_restart

Values: “16″ or “32″
Note:
Setting r_depthbits to “16″ increases your FPS (Frames Per Second).
On some servers this setting is disabled, because it is considered a sort of cheat, giving you a possibility to see through walls in weird places/circumstances.