Huge performance metre hits

I am currently working with Cubase Artist 7, and at random times I will receive lag and a loud crackling sound in my laptops speakers whenever the average performance load metre goes up, can anyone tell me how to eliminate these problems with Cubase?

I have an HP Pavillion laptop, the fact that it is a laptop could be the problem but it is new and runs fast otherwise when not on Cubase.

What soundcard and driver?