Strange FSX performance

I've noticed some stange performance behavior while testing different graphics settings. The game fps doesn't change wheter I'm using AA+AF or not and the fps is even the same wheter I'm on full autogen or sparse autogen. The ground scenery settings simply doesn't affect my fps at all.Could it be that the game is extremely CPU dependant and that the CPU is the bottleneck?AMD 64 3700+ @FX57 2,8GHz2GB DDR PC3200MSI 7900GTO @7900GTX+I started from Landvetter in Sweden and my fps is always at ~25 no matter the settings.http://pici.se/pictures/pCGo9p.jpgThis screen was taken with:General1280x1024 32AA + AF in gameGlobal texture res: MaxFrame limit: 31fpsAircraftMedium-HighSceneryAutogen: Extremely DenseScene complexity: NormalDistance: MaxTexture resolution: 60cmMesh complexity: 69Mesh resolution: 22Water: Low 2.xCloudsDensity: MediumDistance: UnlimitedAnother one for all you who says FS9 looks better :)http://pici.se/pictures/zllk39.jpg