I did a few more performance mods for some parts that I found annoying still in v1.00.14101 (nothing major though):
lowclouds: Simplifies the clouds and smoke effects to reduce the framerate hit from them. Esp. visible when flying into clouds and with runway dust when taking off etc.
lowgrass: Simplifies the grass pixel shader for reduced FPS hit, especially from the high grass. Makes the grass a bit ugly though as it will lose the gounds based coloring.
lowshadows: Simplifies the shadow mapping, it does't have a huge effect, but maybe useful as a middle ground between keeping the shadows on or off for lower end video cards. Makes the shadows lose the softness but reduces the fps hit a bit.
All three are downloadable here:
http://junk.kegetys.net/lowcgsmod.zip
Use is the same as previousy, with:
-mod=lowclouds
-mod=lowgrass
-mod=lowshadows
commandline parameters when sfsMod is installed. (sfsMod readme has more info)