I've had this problem when playing sc2 as well, and if I play for any appreciable amount of time, even disabling automatic graphics switching doesn't help. I'v

I've had this problem when playing sc2 as well, and if I play for any appreciable amount of time, even disabling automatic graphics switching doesn't help. I've actually talked to Blizzard about this (I thought it was a problem confined to SC2), and they indicated that Apple was working on a fix for this.