[Wrexial33]

Gilgamesh, there is a.... similar plugin called lockette, however it uses signs instead of being automatic and unobtrusive. I've been keeping an eye out for an alternative to suggest, but so far no luck, looking for a fix next.

Edit: From a thread I read from May, 2013, a similar problem occurred where InventoryMoveItemEvents were lagging servers to all high hells when using lwc, the prevailing theory was that hopper loops created an increasingly high number of protection queries (going from ~equal to number of hoppers up to 6000 in a 22 hopper loop). However, a fix was found that might possibly work where private hoppers reduced the number of checks per second massively and seemed to dodge the exponential check bug. As of this moment, that is the only solution that seems to have any sort of success, however it was from over 3 years ago, but it is a nearly identical situation outside of the minecraft version.

Edit2: Depending on where Frost got his LWC, there is a release version from march 3, 2016 (not bleeding edge stuff, but if he's using the one from bukkit, it'd be a huge change as that version is from dec, 2014). Allegedly, the version i found is "Official".