I have a large open area in my worldspace, a valley of sorts. It's very bare bones for now since i've just made the first pass on it and made basic topography, but i'm noticing that all the grass is eating up a lot of frames. Does anyone have any tips for lowering the impact? I kinda need there to be grass there, hehe.

I should clarify that i'm not looking to improve performance for Skyrim, but ways to design my world better with FPS in mind.