herer are four shots showing the differences in frame rates between FSX, FSX SP1, FSX SP2 and FSX SP2 and tweaks that i have found
First
FSX clean install

7.9FPS
FSX SP1

8.7FPS
FSX SP2
6.6FPS
And FSX SP2 with Tweaks

13.3FPS
sorry for the funny screen capture, the right screen was when i was using two screens, which i am not anymore
All the setting pages are set to ultra high
My current system speca are as follows:
Pentium 2.8 on a HP/asus p4d motherboard (not the best)
1.5gig ddr 400 ram
512 nvidia 7600gs
and two 40gig ide hard drives
this is an example that you can get average performance from high settings, for me it is a bit to slow, so i have tweaked settings, see my other post with the leveld 767 to see how good it looks, you also get more FPS with full screen, it is good for another 1-5FPS
Edit: added FPS Info to the post, sorry about that

