The game is slowing down. (RimWorld)

Hello! A lot has already been written and said about poor optimization and brakes, but nevertheless the problem is this. The game starts to slow down with a large number of colonists. Somewhere after 25 pawns, the FPS starts to drop and the game doesn't really freeze, it slows down. At 50+ pawns, the speed seems to be half the normal speed and the FPS drops to 10. Tell me, what is the load on? On the processor? For an operative? Too many logical calculations? I put a mod on robot assistants. You can make at least a hundred of them - there are no slowdowns, but with pawns it slows down. Of course, there are many mods and optimization programs, but nothing helps.