I feel like my rMBP with 650m should be able to handle League of Legends on all the lowest settings. I even have it in clamshell mode and don't hear the fans run at all so it can't be taxing my system all that much. I seem to be getting FPS drops a lot even during casual laning phase tho. Could be bad optimization of the game I guess, but if not then shouldn't the 650m be able to keep a consistent 60 FPS even during team fights? Should I try wiping the hard drive? Install some kind of driver? Should I look at upgrading to a newer rMBP or maybe an iMac? I'd really hate to buy a PC and Windows just to play League but I do play a lot so I guess I have to look at it as an option. Does anyone have these problems with League on their rMBPs? I feel like the integrated graphics even run it better sometimes sadly.