Maximum population in the save file before sim culling?

About population increasing

From my experience, there are some places and situations where the game will create a lot of new Sims. For example...

1. Visiting some exotic worlds that have local traits (Ex. Selvadorada, Mt.Komorebi, Tomarang etc.)
2. Visiting the university lots. (If you have Get Famous, the game may pick existing sims instead of making new)
3. Visiting Sixam or Magic Realm. (Other occult worlds didn't spawn as many new sims as those two)

As I don't want to see any new random sims during my playing sessions (for screenshot health), I always let the game add the required sims to the point that they don't need more (and I will fix their appearance before I play that world).

However, some worlds are too needy. In Tomarang, it even needs local vendors. I have to let the game have 2 sets of vendors (2x4) to prevent the new random sims from appearing during the playing session.

I don't mind much about random sims (I can fix it) but it's not convenient (or possible) to enter CAS while playing the story.