just curious - or worried rather.
I hope you have about 15 editor things like meshes open and with real-time turned on given the avarage FPS of 30 rate.
IF you don’t, you should probably just disable the shadow on the grass alltogether and just fake it with an albedo offset - make the base darker then the tips.
You really shouldn’t notice any difference visually since most of the shadows are below a pixel in size anyway…