I have my MacBook Air hooked up to a 46" HDTV so that I can play games on the big screen. Problem is, I notice a slight lag with the mouse when looking around in the game on the big screen. When I look at the game from my MacBook Air there is no lag with the mouse. I heard theres a mode called "clamshell" that would fix this but don't know where to find it or enable it. Info on fixing the lag from the big screen so that games could be playable when watching from the big screen. Thanks.