How would this system compare with the average system here regarding performance?System:Windows XPAMD 2800XPECI MB 333 FSB1 Gig 2700 RAMGeforce 5200FX 256 Ram Video40 Gig 7200 RPM Maxtor HD Tweaks:Texture Band Width in FS9.cfg changed from default 40 up to 400Paging file set for memory set at 1544 megs (the max my system allows) instead of System ManagedAll Sliders Near Full Right except Water DetailLocked at 25 FPSResolution: 1152 X 864Clouds at 30% 3-D (default)Max Distance 60milesI ask, because I am considering the PMDG 737 but Im already experiencing lower frame rates using the POSKY 757 Delta NNC and Sim Flyer

You have to figure out where you are getting lower framerates. What is on the screen when slowdowns occur. That is usually the cause of the problem. If things slow down when flying through clouds, then turn them down (although you have them set reasonable). If you see AI traffic and things slow down, turn that down. AI traffic and clouds are the two biggest framerate killers usually. Try less traffic, and try the FSW cloud textures. Just search FSW in the library. You can "tweak" your system all you want, but if you want better performance, you have to move the graphics sliders around.

I think 25 FPS should be great for you. I find that running the PMDG 737 doesn't really have a negative effect on my framerates compared with other add-on aircraft. It is just a great plane to fly. AMD Barton 2500ATI 9600XT1 meg 3400 RAM

Craig - I assume you mean 3d clouds mostly?thxAndrew

SimFlyers scenery will hammer your frame rates especially if you install the static aircraft and have scenery density set all the way to the right so the airbridges work.Sit at Orlando and reduce scenery density back to normal or dense until the airbridges vanish, frame rate may almost double!Also have you done the autogen mod? Search the forum for it 'cos I can't remember the exact file to rename.As Craig suggested swap the default clouds for the FSW ones and you should be able to set cloud cover to 100%.Best of luck.