The animation of the LOD trees looks really bad. Also I think the grass is moving too fast compared to the trees. So you should probably make the grass move a bit less and the trees a bit more or something like that...
I really like the trees in the foreground, are they yours, or can I buy them somewhere?

Even with a 3 years old laptop, why is it that slow? What are your laptops specs? Are there that many trees outside the visible area? Do you blend out far away grass? Does the recording kill the fps, or is it > 30 fps without shadows? Just wondering as it should be faster...