Worlds Not Loading Properly

This is has been occurring for about a week now. No matter whether I use 1.11.2 or Snapshot 17w06a, an old world or a freshly made world, the game fails to load the world. It manages to approach the percentile loading screen, and then freezes on that screen for several minutes. I have uninstalled and reinstalled the new launched several times.

For multiplayer servers/worlds, I seem to be able to connect for short periods of time, before it crashes to the point of requiring an End Task command (and thus no crash report).

What do I do?