This is a Steam issue, isn't it?

[timtofly]

my laptop is made for games, have a Geforce GTX 660M 8GB RAM Intel Core i7

Then go through steam and get the latest updates. I have no problems with either of my i7 laptops on huge maps, and one is only a nvidea 555m and the other is just intel HD 4000 graphics. Yes the game slows down at late stages on huge maps, but it still plays.