Minecraft outputs a "Server Can't Keep Up" message when I attempt to start a world in Single-Player. This message is expected in multiplayer, but not in Single-Player. In Multiplayer, the server will actually crash shortly after my client joins. I was told to submit this here and I apologize if it is redundant.
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It looks like your issue was fixed after removing all the slimes. Was it?
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Anon Ymus, the problem with this bug is that I don't know exactly what it does, when it does it, or why. Apparently it just makes servers crash when I join.
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It makes servers with other people playing crash when you specifically join? Does this create a crash report?