I've just recalculated all my planning for the 5 million sc3k city i am building.
It will not have 5.4 million but 5.1 million.
I restarted for the third time, because I found yet another method
I also got a new faster laptop. One year goes by in 10 seconds instead of every 15 minutes now.
I have just discovered yet a better method for packing in more and more sims, but I'm sticking with the third one for now and start the fourth after i finish.
In just 5 days the city of Armadasanti reaches 1.6 million sims, that means another 3.5 million sims to go.