Endless Loading Screen - what worked for me

I know it isn't from mods or CC but this is testing without any and even so, I only use two mods - MCCC and UI Cheats by weerbesu.

After reading some info from other people on it probably being the family tree and generations and knowing I have TONS AND TONS of family spanning a handful of generations, I decided to test this.

First I deleted every single family in "other households" and only kept my sim and her kids.

It loaded within 5 min (which is longer than usual).

I exited the game completely without saving and reloaded.

This time I wanted to see if maybe it just needed extra time to load for the family tree to adjust maybe. It worked and loaded in 20 minutes.

That's a ridiculous amount of time so I exited back to world map without saving and tried again since it loaded the first time.

Second time took 10 minutes.

I don't want to wait that long every time, unfortunately, so I went back to the world map without saving and deleted tons of families,but I did keep a good amount and a lot of the usual ones (Spencer-Kim, Goths, Landgraabs, etc.) and some of the ones that I've created. If I knew their lineage was not too interconnected, I kept them.

Went back to my household and this time loading took 3 minutes.

So it seems it's either get through the long loading screens or delete some or/all other families besides your current played households/family. Or start over.