Recently i found a mod on Nexus, called Skyrim Respawn Timescale (just type into searcher there), it is
fully customizable and offers us to clear cells more often than vanilla Skyrim (30days).
These long vanilla cell clearing, makes my savegame bloats (especially with mods that allow You construction of your own villages, homes or just adding a npcs to the game). This mod is simple and clear out Skyrim of dead bodies (Npc's , animals etc.) for example every 10-7 days and so on. Try it.
It helps me a lot and i just want to share that info with all of You.