When playing in singleplayer with a render distance of over 8 chunks, the game immediately starts to lag as if I were in a server with a terrible connection. After reading through the game log, I discovered that the game is taking too long to do what it needs to do with this render distance. The chunks load slowly, broken blocks re-appear then break again, only giving the item when it breaks after a few tries, mobs will "rubber band" from place to place, the sun will move and then snap back from time to time, and this all happens in singleplayer. The output log is shown below in "latest.log"