Yeah mid game the cpu load gets bad. Some tips.
Cleaning up debris into piles to simplify physics calculations.
Removing gasses you don’t need that are floating around the map.
Walling off sections of the map with only one door to simplify path planning.
Killing off or consolidating the wild creatures.
Setting dups (like cooks) that don’t need to leave your base to not be able to leave.
It can be. Lower difficulty and phoebe chillax as the storyteller. I highly recommend modding the game. Both the common QOL mods and tweaks to what you don’t like.