Cursor Lag

Hello, I've recently downloaded xcom for pc and every time I play the game my cursor lags really bad. I don't know how to fix this problem. I have steam. My pc (laptop) is also pretty good as I have an i5 with a radeon hd 5650 mobile and lots of memory. Is there an easy solution or is this rare problem?

I'm also fairly new to pc gaming and would like to get more into it if it is not such a hassle. Thanks in advance.