Only 3 FPS on Mac mini, boot camp, windows 7
Finally! - I worked out what the problem was. 

I had followed the speedup-tip:


  Head to the Control Panel's Performance Information and Tools section, and choose Adjust  Visual Effects. Here you'll find a long list of effects, but simply choosing "Adjust for  best performance" will turn everything off. You'll feel like you stepped back into a decade ago.