This is a Vista ONLY tweak and ONLY for Duo Core processors.

To make use of your duo core in Blackshark

- Launch BlackShark and load a mission.
- When you are in game, alt tab out of it and press ctr-alt-del to 
start windows task manager.
- R-click on DCS in applications and select "go to process".
- R-click again on DCS.exe to then select "set affinity".
Select all your CPUs and click ok.

Done! 

50% until 100% increase of FPS.


More information can be found in this forum thread:
http://forums.eagle.ru/showthread.php?p=572519#post572519