starcraft II set default on med settings with radeon 5730

http://www.newegg.com/Product/Product.aspx?Item=N82E16834220696

the above link is the laptop i have. when i am playing starcraft II, the default forces me to use med-low settings. i have tried to crank it to high and ultra only to be facing super laggy gameplay. my desktop is only a q6600 with a 4830 and it can run it on ultra with no problems...all my drivers are up to date and so is directx..wat is the problem?

 

Try running "Can You Run It?" on your computer and it'll tell you what in your computer needs to be upgraded in order to run the game on high settings.

http://cyri.systemrequirementslab.com/CYRI/