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Also leaks are to show modders what are going on, more of a debugging tool. From day one my server world leaks no lag whatsoever. I suggest doing /chunkloaders and having a look to see if there are any lag machines.
100% agree ill take not to tell people to make a backup, but with this bug I would see no reason to make a backup because the nether seems corrupted. But in saying that making a backup is a good habit.
Sorry just thought a backup would be something ovious and I failed to meantion it. Yes its proby a plugin but if that is screwed up from a plugin there is probly much more stuff messed up.