CVar maxFPS

This cvar sets the maximum FPS of a wow window while VSync is off (disabled). Just because you set this cvar to a certain value, it doesn't mean you'll see that fps depending on your machine's hardware.

Default Setting
This cvar defaults to 0 - which means it won't create a maximum fps, but the game engine has a soft cap of 200fps. However it can be changed to get better computer performance, or limit your FPS if your machine is getting close to overheating.
 * 0

Possible Settings
0-199
 * 0 :Set to wow's softcap (200 fps)

Changing this setting
In-game, type the following /console maxfps setting

Alternatively, you can exit wow, open the Config.wtf file, and add the following line: SET maxfps setting