MAJOR PERFORMANCE IMPROVEMENT
This version of the plugin finally addresses the slow startup time.
Before this update you could expect the plugin to sometimes take over 20 minutes before it was done updating categories. Now, after this update, this time is brought down to under a minute (usually between 15 and 30 seconds),
I highly recommend to update to this version if you frequently restart your server and still want to keep the categories up-to-date, because this will allow your players to be able to use commands from any plugin that uses this API (like HeadsInventory and HeadSweeper) way sooner.