15 years sounds about right, the fastest I've reached 500k with established industries and all is 12+ yearsSpac3y wrote:5 should have been 15 years , missed the 1 hehehehe.
Save Game attached
Ill have a tinker about, perhaps it is housing but as long as the demand index is positive then there should still be enough housing to move into.
Which version of this save game is? It must be quite old, I can't even load it with 4.2.09.
I think the supply/demand index is an aggregated value from all the apartments, and observe closely I noticed each apartment rises its residency percentage independently with each other depends on its overall rating. Hence I believe the faster the population increases in each house will aggregate into higher population increases as a whole (hence more "immigration/population growth" per year). And since sometimes not every apartment will reach 100% residency, hence if a city is large enough, there will be some natural empty-space leftover in some of the less desirable apartments. If only keep supply/demand value very close to 0, the actual "free space" might not exist at individual apartment level.
This mostly just my theory though, I personally felt there's a noticeable difference when supply/demand index is a bit ahead, like in the range between 10 to 20 (later on probably a bit less, around 5 to 10 is enough when reaching 1 to 1.5 million). As to why this is the case, your guess is as good as mine.