0 A.D. currently updates the simulation state every 200ms. This update usually takes 20-40ms, depending on the number of units doing things. This means even if you're running at 60 FPS graphically, when the sim is running, you'll get worse FPS, and worst you might get a lot of 'micro-freezes'. Furthermore, the 200 ms turn length gives high input lag which would be nice to shorten. I ran some quick experiments on Combat Demo Huge to see what changing the turn length would do to performa