Larian Studios Forums Divinity - Original Sin Divinity - Original Sin - Technical Issues Game use only one core?

Hi, my game lags when i moving camera in city and FSP are jumping . Stable FPS are about 30+ when i stop moving with camera.

Here is picture of CPU usage:
Only one core? Wtf?

GPU was about 60 % of usage and about 800MB VRAM.

I have Q9450 and GTX 660. So it should be OK. http://www.larian.com/forums/images/icons/default/tongue.gif