I wonder if the items that are still "loose" on the ground in the world despawn after a while?
I was recently in the mines and on several floors I found items that got "sucked up" when walking by and I thought they were left behind when I blasted through the mines to reach the bottom.
If they don't despawn then the game has some sort of in-game list where it remembers what item was dropped where? Would this in time impact the performance?