I'm playing with Skyrim LE and Dyndolod 2.54 LE version, with out LODGen. When I go to some snowy forest area, like travelling from whiterun to dawnstar all along the main road, my fps will gradually(not suddenly, weired) drop from 50 to 40 on average, then to 30, then to even 15. While I'm facing north towards dawnstar from the giant camp near it, the fps is 60, then I turn around to face the snowy forests to the south, the fps is 20. Even when I go indoor afterward the fps loss won't recover, I'll get a 40fps indoor, it lasts until I restart the game. I've tried switching from EVT to SFO, Or lower my ini LOD settings using Bethini from High to Medium then to Low, but all with no effect. Finally with Dyndolod uninstalled the problem was gone. My mod build is pretty light on landscape retexture or enhancements, but a bit script heavy, with Requiem and some loverslab mods. Landscape, tree, grass and LOD related mods are (in MO mod order): HD LOD Texture Skyrim High Definition LODs - Darker and Grassy Noble Skyrim aMidianBorn Landscapes SFO Tree only 2.6 and its billboards RAT 2K Parallax Treebark MX Grass (from enb particle patch topic) Skyrim HighPoly Fern Meshes (same as previous) Unblievable Grasses 2 Redux Better Dynamic Snow Better Dynamic Ash Blended Roads (normal option, not REAlly Blended) Immersive Fallen Trees Transperant and Refracting Icicle and Frost Atronach and a mod that add some new dungeons or buildings but I don't think they are much related to LOD change. Lagacy of the Dragonborn Now I only use LODGen, the typical fps in those snowy forest is firmly 72, I use Havok Fix (SKSE plugin) and limit fps to 72 through Nvidia profile inspectator. My rig spec is i7 4770 + GTX1070 8GB + 16GB RAM + 128GB SSD for system + 256GB SSD for skyrim and MO(PCI Slot) + AOC 144hz monitor Does anyone got smillar problem like this?