New
#21
Change anti aliasing transparency and set it to Multisample. Change Multi-display/mixed gpu and set it to single monitor... if you're only running 1 monitor.
No game is going to have a constant steady fps; there are going to be dips and peaks no matter what you do. The trick is to get the dips as high as possible. What matters most is not maximum fps, but minimum fps. Get you minimum up to an acceptable level, and that's the best one can achieve.
It's my understanding that your "low" is 56 fps? What's your max?
Two things off the top of my head: set your drivers to performance instead of quality, which they're at by default. You can do that by clicking the blue hyperlink, top left of the driver control panel, "adjust image setting with preview". The second is to check the WoW forums to see if there's a patch or secret WoW setting that you should apply.