Messed around with command blocks on multiplayer servers, ended up making a horse that was very fast. Noticed that the way controls work aren't just difficult, but completely broken, to the point where just holding the W key does nothing at certain speed values, which were nowhere near the maximum, or the minimum. A horse with speed value 50 does not move at all, yet a horse with 1024, which is the maximum, completely shoots out of rendered chunks, and does not go nearly as far as it is supposed to. Might of just been server lag, since this was on a Hypixel SMP, but the issue was certainly interesting.