Iv notice that weapons after fallen enemies that is left on the ground dont seem to disappear, even after many days.
Now I can find small heaps of weapons lying on the ground all over Skyrim. This are weapons I normally dont bother
to take with me, even for selling. Shouldnt those weapons disappear after a while? Iv killed enemies by the hundreds and
if all those weapons I dont pick up permenently stays in the gameworld wouldt this cause a problem after a while, I mean memory wise?
I remember this prob from another game, namely STALKER. Late in the game I would litterally walk over fields of weapons. LoL.

For Morrowind and Oblivion it's every third ingame day, but it seem to be a bit longer in Skyrim in my experience. Not sure how long it actually is, though.

For me bodies typically disappear in three days or so but I have been seeing weapons scattered about weeks after I killed their original owners.

If it gets to be too much you can always go into the console, select the weapon and then type "disable". This will remove it from the game and hopefully improve performance.

Thanks guys. I will add that it hasnt caused any problems as far as I know but just wanted to ask. Cheers