Crash while a player was standing AFK on our snapshot server.
See crash report.
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That duplication is not correct. MC-63590 is about the watchdog because a property could be set to 60s instead of something lower.
This issue is also watchdog. The reason for the watchdog must be determined. I cannot do this, I have not access to the source code. The problem was introduced int 15w50a. We had watchdog crashes on earlier snapshots as well but in 15w50a everything started lagging and we get a lot of crashes. The game is not playable as it is the 15w50a snapshot.
Executive summary: Something introduced in 15w50a is causing the game to lag badly.

may we remind you that you are playing snapshots? preformance increasements are done in the very last stage of the update development, we're still in the bugtesting phase