@Slin: the LOD movement is indeed bad at the moment. It's hard to make them move better, because they have only 8 vertices and they are clustered. The trees and grass models you be bought on Dexsoft Games. My graphics card are a Mobility Radeon HD 5450. The last AAA game I played with this was Fable 3 and I could only play if I set all graphical effects to Low. The grass is only visible in a range of 100 metres. It's the shadow that kills the fps and even all other Shade-C effects I've activated (SSAO medium, Antialiasing, DoF, HDR).
@Harry: the movement is basically really like a metronome, it's based on the 3DGS default tree shader. I have to implement some random wind speed and direction variable.
