World of Warcraft has been running frustratingly slowly on my Retina MacBook Pro. Though it has a lot of pixels to push the machine’s CPU and GPU are quite fast… and Warcraft had been running much better.
In fact, it was now generating around 8 frames per second (type control-R while running it to get the fps displayed). I tried exiting other applications, killing background software, rebooting, nothing helped. Then it mysteriously improved and was quite playable for a while (30fps). A couple of days later for no apparent reason it cranked back down to 8fps.