I was making a stack of 12 Demons,(Kingdom of course) was taking like 45 turns, I dropped a +25 or +50% training building in the City and it completed the Unit for me, so it was 40+ Turns early.
On another note the Late Game slowdowns may be connected to the Mem Leak, as when you run out of Mem it will start using the Hard Drive.
GL with all the stuff, Still enjoying the game.
Lee