this is a shock I feel like i got took for 50 bucks I was going to buy the deluxe glad i did not my computer is not bad 160 gb 256 ati 850x 2ghz 1 gb ram and will not run
this so called flight sim i did tweak a little did help some and tried to put captain sims 757 200 in forget it hope this helps you who are wondering maybee i can save you money


Autogen tweak that might help  
Many of you have been frustrated that you can't control the density of autogen trees verses buildings because we only have one slider to cover both of them. Some have also been frustrated that our lowest autogen setting is more dense than FS2004 at max density.

If you add these two lines to the [TERRAIN] section of your FSX.CFG, you can define the max number of objects in a terrain cell for trees and buildings independently. The slider will scale down from the numbers you set as the slider is moved to the left. The max tree value in FSX as released is coded to default to 4500 and the building default is 3000 (as shown below) and the absolute max FSX will recognize at all is 6000. Of course if you raise the values beyond the defaults, you will obviously be increasing density and lowering fps (so don't complain if you do this...). The point in sharing this information is that with these settings you can specify what the values are yourself. Set buildings or trees at 0 and you won't get any of those objects no matter where the slider is set.

TERRAIN_MAX_AUTOGEN_TREES_PER_CELL=4500

TERRAIN_MAX_AUTOGEN_BUILDINGS_PER_CELL=3000
change it to 1500 1000

found in simvation.com forum