Im not too keen on laptops but I just recently bought this one for school so I could play all my game pretty smooth. I was dissapointed when games like L4D, TF2, and C&C3 (especially C&C 3) chugged pretty badly. I disabled many background applications and programs to reduce CPU usage but no improvement. This has 6 gigs of ram and the i7 q720 so i know that this should be a hefty gaming laptop. Im just wondering if there is anything else that could be holding this notebook back?
It's VGA is GT 230M right ? if so then GT 230M is a mid range card,so if you lower your in game settings(it will be fine with medium settings) and play at a resolution like 1280x1024 or so i think you will be fine,have you tried this ?
As Maziar said, CPU power and lots of memory don't translate into gaming performance. Your graphics card isn't that great, and that's your issue. Lower the settings.