I was playing in my survival world, and I knew where a Jungle was, and I wanted to find a Temple, so I went to the Jungle, which to mention is not that far from spawn. After spending some time in the Jungle, I noticed I was experiencing rubber-banding. At the time, I was recording, so I will upload that to YouTube. Mining Iron was a problem, but Stone wasn't. I found a cave, and decided I would go in it, only to find that there were 100 km/h baby zombies. They were coming at me before they were rendered coming at me, so they seemed to teleport. Hitting them was a pain, so I had to run away. They followed me up some trees, still rubber-banding. Hitting them accented that point. The sun was also messed up.

The video will explain it better: Soon