I've had the same issue for months and I've still not gotten around to actually fixing it. I've tried many times but always unsuccessful. I use Citizens NPCs as my main shop system on my server, and I always have to reload citizens, because clearlag keeps deciding to just kill them. I've tried the world filter stuff, but due to it being poorly documented I don't even know if I'm doing it right. My config his here: http://hastebin.com/odutefacus.rb What I'm trying to accomplish is to stop clearlag killing mobs in the world "Union_Prison" Any help is appreciated.