Pup,
Basically what everyone is trying to say is that even at maximum performance, your computer(s) cannot run FSX very well. I'm not even sure how well it can run FS9.. I use FS9 and mine looks 10x better than your FSX with my ASE, FS Global 2010, Birds Eye View, Ultimate Terrain, and REX..and even flying into the NYC area with FSDT's KJFK, Imagine Sim's KLGA and KEWR, Aerosoft's Manhattan, AND Mega Scenery, I still get 30+ FPS flying into it in payware aircraft with the aforementioned scenery and texture programs running.
But we're not criticizing you. We're just saying if you save up and invest in a new system, you can get so much better results than what you're getting now..you probably can't even comprehend the difference.. But if you're happy with what you have then by all means stick with it! Like they say, if it ain't broke, don't fix it!