Hi Krohm,
Fair enough, although I dont have an I7 ("just an I5 2320").
You do trigger me to upload a demo;
www.sierracosworth.nl/gamedev/2013-01-11-demo.zip
Would you like to try it out and see how it goes?
(controls are W/S/A/D, PG UP/DWN, ESC to quit)