Hey guys Im running diablo 3 on my M17x but its very laggy and I really dont know what to do.. Does anyone know how to check to make sure my graphics card is changing when I start the game where as when there are no games running? I mean 560m Nvidia shouldnt be having problems..

Windows 7-64bit
Intel(R) Core (TM) i-7-2730QM CPU @ 2.00 GHz
8192MB RAM