HD 4000 poor performance

Hi,

thanks for reading this. I have an ASUS Vivobook S400, so I'm using the

Intel HD 4000

Intel Core i5-3317U

4GB RAM

and my performance is pretty bad, a lot worse than expected. I've noticed however that my clock speed sticks stubbornly to 350MHz... shouldn't turbo boost up that? Also, my temps are at 55C, whether I try to game or not.

Is maybe GPU-Z not reading it right? I'm going to run 3mark06 soon, once it's downloaded! Thanks for any advice

Franz