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@Velocio
If anyone was wondering what that was... basically DNS lookups were failing on the database server, and all connections to the database server were being queued with most timing out. The result was everything went very slow.
Answer was over here:
http://forums.mysql.com/read.php?30,27073,27090#msg-27090
Adding skip-name-resolve to my.cnf avoids the needless DNS lookup and everything is flying again.