Speed Up++++++++
Very powerful optimization mod.
Speed up late game significantly by changing one thing: disabling AI from using ‘law_no_migration_controls’.
WHY it works: Migration creates many different pop groups everywhere, the number of which grows exponentially when everyone are using this law. Note that the resources needed to calculate everything scale with the number of different pop groups (if either of job, culture, religion, state is different, they are different groups), rather than total population.
One PDX designer comfirmed on reddit that this is THE major cause of late game lag.
Please note that this is expected to have some negative effect on AI economy.
