That is true. I forgot about that with Subnautica. I remember experiencing lag spikes with terrible texture pop-in when entering new biomes. I remember watching a streamer play a version near release and he built a large base to mess with one of the leviathans. But it caused the game to seriously lag. In the following video, he says the devs asked for his save file so they could use it to optimize their programming. I don’t remember how much of an impact it made, but it did improve a little.