This issue isn't to do with Pex or WorldGuard. I've tried some alternatives and although the funny timings have gone (I think that had something to do with Pex) the lag spikes of <10 TPS still come and go when the server is busy. It's not an entity issue because sometimes we can have 8000 entities and be at 20tps and other times have 6000 entities and be on 6tps. Are there any tools I can run to see if my world is corrupt? What else could cause this? I'm really needing someone's advice here! Bump EDIT by Moderator: merged posts, please use the edit button instead of double posting.