It has been established that the only "calculation" the server does inform other cities of your available resources in your unopened, frozen city. Additionally, it handles game saves. All city simulation is handled client side.
So to run an offline region you'd need to engineer a local save, and then figure out a way to determine the available resources in these locally saved cities. Something pretty advanced, like a 1kb CSV might be able to handle it.
So to run an offline region you'd need to engineer a local save, and then figure out a way to determine the available resources in these locally saved cities. Something pretty advanced, like a 1kb CSV might be able to handle it.