Originally posted by Lil Puppy:

I have like 120 fish just sitting above the surface of water just outside of physics lock range of my base on a peninsula. Unless I go out there in a boat so the physics engine can reattach to them, they'll just stay there forever. Devs need to clean up that stuff or stop spawning things in at that distance.

My biggest performance problems come from a mod that auto-picks and auto-loots and I didn't know it had a toggle switch... so my entire world that I've meticulously mapped has random loot just everywhere. It only causes frame hitching. It's totally bearable and I terraform like crazy cause I hate the event mechanism. My save file is about 25mb at the moment so it's not huge but it does take about 20 seconds to save on a pcie4 ssd.

Performance in this game is way better than most of the crafting base building games I have aside from maybe Satisfactory. But I also don't play on a server or with friends so it's all about my machine.

For your situation, If you have no intent to clean up the drops and for whatever reason they don't auto despawn after a few in game days, I would run the command from console. Not sure if that also works on the fish, but there shouldn't be that many fish in 1 spot unless they were console spawned; sounds like a bug if not spawned.