i bought this: http://www.newegg.com/app/ViewProductDesc.asp?description=15-116-616&depa=1 its a tv card with composite in on the back. i installed it everyting worked fine and the tv and radio works fun. BUT when i plugged my gamecube into the composite ins it lags tremendously. not the actual game but when i move my controller i can literally count 2, 3 seconds before the game responds to what i did. why is this?