This is a super specific issue but its driving me crazy. When I use large landscapes with the landscape grass tool, and when I render my animation sequences using the movie render queue tool, i think the grass is trying to populate throughout the whole map. None of my grass or foliage scaleability settings are being respected. My Ram usage jumps up to 64 GB almost instantly, when the same PIE session takes about 10 and runs smooth as butter. Ive tested on smaller landscapes in otherwise empty levels, and been able to get a render out, with Landscape Grass, but i notice that it still extends far far into the distance, like its never being culled.
Ive checked the materials, the foliage placement tool and regular static meshes do fine, its just landscape grass.
Posting this here as a Hail Mary in case anyone else has run into this