Corpse or Spawning?

[protttt]

I use OBIS http://www.nexusmods.com/skyrim/mods/31264/?tab=1&navtag=http%3A%2F%2Fwww.nexusmods.com%2Fskyrim%2Fajax%2Fmoddescription%2F%3Fid%3D31264%26preview%3D&pUp=1
I have a serious problem with the corpses of the bandits. After installing I tried going to a bandit camp and my game suffered a significant decrease of fps. At fisrt glance I thought this was because my rig's not good enough. However when I finished killing all the bandits, the game was still very laggy until I left and be far from the camp.
FYI, I have some AI enhance mods including Duel - Combat Realism, Revenge of the Enemy, Ultimate Combat which are - as I see - the reason why it is very laggy when entering combat with many npcs. For example when I enter a legion camp with many imperial soldiers npcs, the game is stable till I try to hit a random soliders (of course it would be the same to the bandits unless you were one of them lol). After the fight, the result is: the camp with the corpses of the legion soldiers cause no lag, while the bandits' corpses do. Therefore I put away that lag matter when fighting and focus the problem after the fight. That's my point.
Can someone help me with this? Is this a matter of spawning system or just the corpse itself?
After a long time playing, my save got corrupt! I can hardly move my camera, when i try to look to other direction freezes 1-2s then continues the process.
oh and I use Dead Body Collision, I'm thinking, is it the problem?
Thanks in advance,
( This problem also happens with Populated Forts Towers - a bandits mod too - but that was removed on my game due to its uncertain quality and spawning system, though the game is still in trouble with OBIS)