When I booted up Minecraft today, I noticed one of my worlds got affected by an update as when I used a minecart, it was very slow, I could sprint faster than the cart even if it is on powered rails. This could be a bug as I didn't find anything on the update notes. It is an annoying issue as much of my world operates on that transportation system. UPDATE: Only occurs on split screen, everything returns back to normal when singleplayer. Sounds of blocks breaking and placing are also affected as the sound seems much slower and latent compared to when playing singleplayer. It may be an issue caused by the split screen feature. I have checked for possible lag but offline or online it still acts the same.