here some reasonable settings for nice LOD as a short guide or checklist:
(some settings can maybe lowered if you use dyndolod)
performance changes are related to your hw. make a copy of your ini settings before testing!
fLightLODMaxStartFade=32768.0 (max. depends on ugrids setting)
uGridstoload=7 (noticable performance impact, much more visual fidelity and lesser object pop ups. in my opinion worth it and in the meantime my standard setup for sse and fo4. no stability problems for me at all but use it on your own risk, higher ugrids like 9 or 11 are possible but not reasonable due stability issues with quests and other game and mod related triggering)
iMinGrassSize=50 (lower number=denser grass and also more perfomance impact)
fLightLODStartFade=32768.0000 (max. depends on ugrids setting)
uLargeRefLODGridSize=23 ;13,15...25 (higer number=more perfomance impact, enhances grids terrain LOD detail, but not trees)
[TerrainManager] (higer number=more perfomance impact)
uiMaxSkinnedTreesToRender=96 (or even higher)
fGrassStartFadeDistance=28500.0000 (max. depends on ugridstoload, performance impact)
fLODFadeOutMultObjects=40.0000 (performance impact, lowering settings means reducing the distance lod objects are still visible)
here you can compare the results in a landscape collection using these settings:
the forgotten vale with the mod naaslaarum - this snapshot is also taken with the above settings
thank you for reading, your experiences and suggestions!