Alternative to grass, tree or mesh

Hi everyone,

I am creating a game where the character is moving very fast. And I would like to add grass to the active terrain. Sicne the player is moving very fast, the grass is shown a very shoirt time before your each it, and I would like to change that.

I tried: - to increase the detail distance but apparently this doesn;t work anymore. The max is always 250. - to replace the grass by trees but then the performance is terible ( shwadow, overall lighting, etc) - Just add a lot of grass meshes, but again, the perfiormance is terrible

So the question is simple, do you have an idea to make one of these solutions work, or do you have an alternative to that?

Thanks a lot in advance.