I am having the same problem. I've tried everything that was said here, also tried to modify the oblivion.ini and got no improvement. I was with all the graphics options with a maximum average rate of 45 FPS outdoors. After running TES4LODgen my FPS dropped from 45 to 10-20. Does anyone have an idea of what can be!? Because I read in several places and all saying that the drop TES4LODgen not so much the FPS. The MODS installed and their order are: UOP Unofficial Shivering Isles Shivering Isles Knights All the Official Plugins Official Plugins Unofficial Patch Kobu's Skip Intro Mod Fame and Infamous Announcer FGPorter Nofollow Map Marker Overhaul Map Marker Overhaul - IS System Aspect: Intel QuadCore Q8300 4GB DDR2 RAM Nvidia GTS 250 - 1Gb ASUS P5KPL/EPU Windows 7 64 bit There is some problem or my system can not handle the TES4LODgen? Thanks to anyone who can help! Ripa PS: Sorry for writing but I do not speak English very well.