After updating to 3.00 Alpha 11 I finally managed to generate grass LOD for Veydosebrom Regions. Total size of LOD meshes is more than 16 Gb , and I'm getting infinite loading screen when I'm trying to load exterior cell in game. Must be I need to reduce grass density before LOD generation, though it was not too high, I used iMinGrassSize=50. Here is an example of LOD mesh - https://drive.google.com/file/d/1LXMH5DJxESUEyadwF-lbkYCAKm9nLqyQ/view?usp=sharing