It changed it 1.1 first,And has been tweaked ever since
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+ Population growth revamped to put more emphasis on population growth ability and morale.
Population Growth tweaked so that abilities are taken into account BEFORE morale bonuses. Net effect is that population growth ability not quite as powerful.
+ Population growth fixed dramatically. This is going to have a significant game play result that we're still having to fix in the AI. Before, on a class 10 planet with a morale of 70 your population would increase at 20% per turn. Now is would change at 3%.
The "population growth ability bug" wasn't a bug but rather a problem with having populations in billions rather than millions. The population growth was previously capped at 200 million per turn. 20% of say 1 billion (or
higher) reached that cap. So all those bonuses meant nothing.
Now, at 3%, if you have a population of 1 billion then you're looking at an increase of 30 million per turn X your population bonus. If your morale is 100%, that gets doubled again.
Here's the thing: If you drain a population down to only a few billion, it'll take you a very long time to recover. Say goodbye to mass colony rush. You'll need to be very careful or else you could end up with a vast empire of tiny populations producing no money while smaller empires grow beyond you and conquer your weak but large empire.
Population Growth = CurrentMorale X Government Level X PlanetQuality Factory X GrowthFactor.
+ If your morale is > 75% you now get a 25% extra bonus to population growth. If it's at 100% you get a 100% extra bonus.
+ Population growth ability taken into account at the very end of this process for maximium effect.