Testing Consistency...

[JG14_Jagr]

Try the following settings

Turn Grass and Shadows OFF
Turn Building Details to Low and leave Building numbers at HIGH or medium.

In my testing over London turning shadows and grass OFF made a BIG difference in stuttering

[Strike]

Really I don't understand how the devs got the grass laggy. I mean, it should have a really really short view-distance of a few hundred meters and gradually grow shorter and shorter with distance until it matches the ground texture color.

Grass is only pretty and useful when taking off or crash-landed. If you are flying so low that you can make out the grass details then you are going to die :p

I know, grass looks good and realistic, but it should be scalable. Have the "high" setting for what we have ingame now, and a "low" setting for short view-distance and perhaps lower resolution textures.

Buildings I get. Each building casts it's own shadows. So for each house in london being rendered, you can multiply it by 2, and add the extra strain for casting the shadows on the nearby houses + dynamically moving with the sunrise/set. Go figure why it lags :p