Same for me.
My specs:
Intel Core2Quad Q9400 @ 2.66GHz
RAM 4GB DDR2
Nvidia GeForce GTX 570
Windows 8 Pro 64-bit

Screen:
http://i47.tinypic.com/570h0.jpg
GPU @ 39% and I get 14 FPS, GPU utilization never go up to 50%.

Sorry for my bad english.