от автора с нексуса:
Example of Skyrim.ini (red=important):
[Grass]
bAllowCreateGrass=1
bAllowLoadGrass=0
iMaxGrassTypesPerTexure=7
iMinGrassSize=20
Experiment with iMinGrassSize. Higher values means better FPS and less grass. 20 works great on hi-end systems and will give you very lush grass (don't use with other mods that adds grass) Use a value of 40-60 on low-end systems.
Соответственно, у кого сильно тормозит 2 версия пробуйте разные значения iMinGrassSize