So, basically my girlfriend and I got nearly identical laptops, the only difference is hers has a little bit more ram. We have the same processor and gpu, but when we game together, every game lags on hers, where it runs perfectly on mine, and it's been this way from the start. We both have the notebook version of the Ivy Bridge i7 with the Nvidia Geforce 640m. We have done numerous hardware checks and driver updates, but hers still lags and mine runs perfectly. Everything matches up, but our systems act differently. Can anyone help out?