I see by your screenies of your settings that you have everything pretty much maxed out. Don't care what kind of a machine you have, those settings are going to tax your system.............but you can do alot and still have great visuals and reduce the stutters if they are directly related to the graphics in FS9.
Even though you are using the frame rate friendly cloud textures, clouds are still big hogs as far as processing power goes. Sooooo.....to still get great looking skies and free up some proc. pwr., turn the sight, draw and % of coverage down. Half of what you have will still look great.
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