I started to play this game since yesterday. I have a Macbook Pro 2009, so I have both NVIDIA GeForce 9400M and 9600M GT graphic Cards. I have been switching between these two and found out, somehow I get better performance on 9400M. It is very smooth when I use 9400M and when I switch to 9600m GT, it was very laggy.... Does anyone has the same experience? or Does anyone know how to fix it?