[MC-6330] Sometimes the game speeds up randomly

Resolution

This report is invalid as this bug seems to be caused by Java.
See Galaxy_2Alex's comment:

That would be most likely a Java issue

At random times, the game will speed up by a lot and after a few seconds will return to normal.
Has not happened in a superflat world. There seems to be no "real" way to reproduce this, but it does happen and has happened before in the snapshot.

Play a world for long enough. You will get it eventually.