Hello, I will bring my testimony. On my Oldrim game, heavily modded and tweaked, I held 200 hours of play with uGridsToLoad=9 before my save becomes corrupted. Of course, I had a CTD once an hour of playing on average, but this was due to the limit of 2.8-3.3 GB of RAM. By cons, to 200-250 hours of play, freezes and infinite loading screens appeared. I had to give up my game. (Bug every 5 minutes, unplayable!) I thought that with Skyrim Special Edition, I could push the limits further. 78 mods are installed. I started my game directly with an uGridsToLoad=11 and uLargeRefLODGridSize=31. No problem with my test character during 10 hours of play. Except a Mammoth or 2-3 NPCs of Whiterun which sometimes levitated in the air, at 100 meters of altitude. I said to myself: bug of the Havok but without incidence ... No crash, no problem loading ... if only that, it will pass. I start my real play of Skyrim. No problem on the first 10 hours of play, apart from there also 2-3 cases of NPCs that floated in the air in Riverwood. Go to Whiterun. 5 days in game passed and 10 hours in real life... I go to a dungeon. At the exit, 3 skeevers levitate with their AI disabled ... I sell my loot and go to Arcadia to make a potion ... CTD when leaving the alchemy menu! The first in 11 hours of play. I reload and kill the smugglers who are hidden west of the ramparts of Whiterun... One of the three enemies levitate with no IA... CTD after 5 minutes of batteling. (I've play on Legendary difficulty, so the combats are long.) I reload and slept 24 hours at the Bannered Mane. I decrease the uGrids to 9 by doing the necessary manipulation on the console (refreshini code). No more NPC floating in the air. I can play an hour more without CTD or hover bug. I return in south of Riverwood... I have to reload a save there ... and there, infinite loading screen. I realize that my save is corrupt. I disable all my mods. I go down the uGrids to 5 (refreshini ok), cleaning the save with SkyrimTools (maximum power: all cleaning option). Same problem south of Riverwood. If I reload a save here. I resume my Helgen save with the uGrids at 11 with all mods, then and speed run to make a quicksave at the same place with my level 1 hero. No infinite loading screen. So my save is really corrupt. No more doubt. Probably because of the Havok. (Mods were found innocent.) The physical engine is not designed to handle a large uGrids. It completely disrupts it. If you see NPCs levitating while being frozen, this is a warning sign to take very seriously. In the short term, the uGrids cause no problem (ideal for the most beautiful screenshots). Over the long term, it's suicidal. It destroys the save slowly. Revert uGridsToLoad doesn't clean the save. The antidote would be a reset of the Havok, but SkyrimTools Special Edition does not manage it yet. uGridsToLoad=11 => Corruption after 15 hours of play. uGridsToLoad=9 => Corruption after 200 hours of play. (And I think I was lucky.) uGridsToLoad=7 => I think it should stand for several hundred hours of play. Best compromise. uGridsToLoad=5 => No problem: it's the vanilla value. But the display distance is small. FPS is not a problem. With a GTX980M 8 GB, I was at an average of 40, with 30 FPS recorded to the minimum. And strangely, Skyrim SE never exceeded 3 GB of RAM (with Data folder of 21 GB, 78 Mods + heavy ini tweaks.) It seems that now it is wiser to modify uLargeRefLODGridSize=11 to 21 or 31. More safe. I'm good to resume my game from scratch.
