I unchecked a few scenery areas like Asia. I fly in USA only at present.Does that mean performance will be or should be better?Many scenery areas have numbers lik "1006 BASE".I have no idea what these do.Can they be unchecked also?I left the priority order the same, unchecked or not.Is that ok or should I move all that have been unchecked to a higher priority number (further down in the list)?I know the existing priority order has something to do with layers but I have never looked into it. Thus, I did not change the order.Whenever I change views there is alot of hard drive activity indicating that scenery is not "cached" in memory.I am trying to reduce this hard drive activity.My Dell PC is 3GHz, 1G memory, PCI Express video card with 128Mb.I know these specs a low for running FX but Dell wants $300 to upgrade the video card to an SLI card with a piggyback card 512Bb, $300 to upgrade the memory (two memory sticks each 1/2Gb) for a total of 2Gb in my PC. A fully loaded PC would be $2700.That is why I am looking at scenery now. I do not know what scenery actually loads at startup. I want to reduce this overhead if possible.Any help would be appreciated.My PC runs 20FPS with minimum to low settings. I did a few of the suggested tweeks (trees, buildings, fibers).I kept just enough untweeked to see good airport taxi lights and a little better than FS9 scenery.

Removing scenery areas may speed up the initial load of FS, but once the scenery is loaded and you are in the sim, there should be no change.Someday, someone will use the tools available in the SDK and list which areas are covered by which of the folders - but the reference is in the Terrain SDK - so you can see how they are numbered.The named regions are just certain cities.Personally, I'd recommend against removing anything default from FSX, or any version of FS. You never know what may reference something in a different folder - a texture, or model file.