Had massive difficulty logging into my world and once I finally managed to load it (after being stuck on "generating world" 3 times and being forced to manually quit my game) I was only running at 8.8 fps MAX as opposed to the usual 60 fps. Lots of textures either missing or broken completely, chunks refusing to load, sixth and seventh slots of my hotbar missing, and a lot of controls not working (i.e. inventory can't be opened, chat can't be opened, game can't be paused, items that are dropped no longer exist as an executable entity, etc.) Please fix this as soon as possible!