A tip i was given is :
Open Config.wtf (you can find in WTF folder in wow folder)
And in the bottom, add the following:
SET maxfps 25(my computer sucks, increase if you feel your computer can handle it)
SET maxfpsbk 5 (to the windows not highlighted)

These are the same as /console maxfps but you don't need to make a macro for it, and it automatically loweres the FPS to 5, if you are not having it "activated".