I just installed the game in bootcamp yesterday and played for maybe 30 minutes, but I was very pleasantly surprised that the game runs well in 1440p and high settings (with FSAA). I don't have any idea what the FPS were, but subjectively speaking I was getting smooth gameplay, and that's what counts for me. I even put it on very high settings (the game actually defaults to this setting), which still remains somewhat playable, even though most people including myself wouldn't want to play that way. It's noticeably slower this way, but what I found remarkable is, that it still runs without becoming a slide show. I'm just amazed how capable the new iMacs are when it comes to gaming. Since I had to go through a bunch of replacements, I had been debating to return the iMac and get a PC instead. I'm glad I didn't, because I really love the iMac's design and especially missing out on Mac OSX would've been sad, and in terms of gaming I personally would've gained very little for the money.