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Assuming you are using 1.4.0, you can add a world name (exactly as it appears in game) to the DisabledWorlds list in the config. You can also do some voodoo with permissions to accomplish the same.
The latest and I'm getting alot of lag with this version and crashes: http://pastebin.com/etSv81jQ
A moderator from spigot said "ProjectKorra causing worldguard to check if a player can build the causing groupmanager lock up. Ensire they are all up to date"