Up until a few days ago my rMBP was a beast for games. The past few nights I have really started to notice a drop in performance and FPS while playing any game. My spring 2011 MBP is now outperforming my rMBP when I compare them side to side playing WoW with the exact same settings and resolution by about 25 fps! A few days ago I could play CS:GO with topped out graphics settings and stay above 60 fps, now I do good to stay in the 30-40 range! Does anyone have any idea what might be going on? It's extremely frustrating to say the least.