Relativity does change the speed of the game clock. By default, sim time passes at one sim minute per real time second. If you set relativity to 19, one sim minute takes two real time seconds. Most of the time, I set relativity to 28, meaning a sim minute takes 1.5 real time seconds. But, if I'm playing in a town where it takes longer to get around in, like Bridgeport, I'll set it at 19. When adventuring in WA worlds recently, I decided to set relativity at 13, with one sim minute taking about 3 real time seconds.
