Platform: PC Steam, Singleplayer game.
Having random huge FPS drops after I loot dead insects, and it lasts until particles of the creature gets vanished. This drops doesn't appear with small insects, as mites, aphids, weevils, etc. Also freezes ends when I turn around and can't see the parts of the dead body, and freezes appears, when look at them again. Otherwise my game works really well, in spite of the fact, that I have a pretty decent laptop configuration though.
So, I consider, there must be an issue with dead creatures' parts optimisation on a weak PC.