I am playing Call of Duty: Modern Warfare 2 in 'Low' settings, I have a Core2Duo processor clocked at 2.8 GHz, 2GB RAM, an nVidia GT 218 Ion PCI x1 slot 512mb 64 bit GPU. Its more than the games minimum requirements, my drivers are all up to date and I'm still experiencing lag.
Why is this so? Is there anything I can do?