Maximum population in the save file before sim culling?

I know that the sim culling reason is for game performance. But what makes me feel unsafe to play the game without mods is because I can't control or avoid the game deleting or editing people without my consent.

My play style is to take care of every sim including NPC, If I don't like some, I can delete them manually. I don't like how the game secretly does something like this.

Most of my mods are about to control the damage of unwanted progress that can't opt-out. 😂