Specs for the system? Assuming it's an average laptop and you've just got a below average integrated graphics card, you're probably not going to end up getting a decent performance at all.
That being said, somewhere in your control panel go to system > advanced system settings > performance and tick the circle that says adjust for best performance. This will make it not look nearly as pretty but you'll see a slight difference in performance. Also, I'm not sure what kind of a rep it has around here but I use Game Booster and I think it has a decent effect on my performance.
I'd also say, rather obviously, make sure you're running on minimum settings unless you can get it running better.