Early in the evenings I'm starting to see noticeable decrease in (what I presume is) tickrate: pressure plates not finishing, redstone not switching, water not flowing. I'm not sure if this is a recent phenomenon as I've only been on for about a month now. The suggestion from in-game chat is it could be caused by excessive chunk-loaders.
Is there anything we players, or the admins, could do to combat this? If it is chunk-loaders, perhaps it's possible to limit them or auto-clear them every few days so we don't get a buildup of forgotten loaders? I'm not sure what's possible here.