Culling and genealogy pruning are background processes run in the middle of the night to remove households for performance :
- Households that are both unplayed and unhoused can be culled when the population reaches around 285
- Households who are played or housed are never culled
- In addition to that, unplayed Sims who have a played Sims as a close relative can also be kept (up to 100) in a simplifed state.