Constellation of the terrain detail and object detail: FPS thief

[Raidar 1]

The terrain detail i allways had on low, because it ate away all my fps (the most when looking through a scope, trying to shoot someone running through the high grass).

But now i found out that object detail decides how high the fps hunger of the grass is (i knew it chanches the grass density, but not how big the influence is).

Example: Looking through DMR scope through the grass

------------------------------------------------------

Object: very low------->60fps

Terrain: low

Object: very low------->60fps

Terrain: very high

-

Object: low------->49fps

Terrain: low

Object: low------->47fps

Terrain: very high

-

Object: normal------->27fps

Terrain: low

Object: normal------->25fps

Terrain: very high

-

Object: very high------->27fps

Terrain: low

Object: very high------->25fps

Terrain: very high

That means the only way to look through the grass with a scope, with decent fps, is to have the object detail on low and the terrain detail hardly matters? Why not just seperate these settings and don't mix em up? I know that the grass is much denser if you change the object detail from low to normal, but i think 30fps less is a little much. Especially when the change of terrain detail from low to very high doesn't make a big difference.

Specs:

Q9550

2xGtx-260

Grtz Ra!dar