Minecraft wiki entry for Mule, associated text: The maximum speed of mules, when created by breeding a horse and a donkey, varies between 4.8375 blocks/second and 14.5125 blocks/second (compared to the player's walking speed, which is about 4.3 blocks/second). About 68% of mules are able to go faster than a minecart. Any mule spawned with its spawn egg always has a speed of 7.525 blocks/second, which is slower than a minecart at full speed. Mules are slow-moving backward, and about as fast as the player when moving sideways.