This may work for those out there that have FSX and want to increase fps It works for me in DX10 and I am now running at MAX on all settings except the traffic setup. Ultimately you want to have as much free resource as possible on your PC as possible.
If you click on Start and select Run, type in MSCONFIG and press OK. In this menu, you want to select Startup. I have deselected all start up programs and then restart the PC. I have found by doing this, you will not have any programs running outside of FSX. This may work for those out there or it may not work for those. It does does help to have a good video card.
I have a core 2 processor, 2 gig of ram, and a 8800 gts 640 card. I found that in DX9, I have to back down the settings in FSX but in DX10, it works very well on my rig.
Just an idea.
Jetman
First Officer