So, I always thought that Noble was the level where things were supposed to be equal between the AI and human player but maybe I was wrong. I was just fiddling around with the world editor right after a few rounds after a start in a noble game and I noticed that the AI civs were able to make a warrior in about 4 rounds while it was going to take me 8. Is there something that I am missing here or do the AI civs get a production bonus on Noble level?