Grass/Foliage Optimization Help!

I have been making my game for about a year now, and my biggest problem is grass DESTROYING my fps, or any foliage in that case, i have shut all shadows off in foliage, i try to use as less foliage as i can without looking too bare, my map isnt TOO big, but it still just destroys fps. ANY tips, tricks, or even hunches on how to optimize foliage a bit more, that would be great!!!

Regards,

Oskar