So i have had some extreme Server lag, I don't know if it is because i am using windows xp sp2 x64 to run it or what. but i am also getting this too which i have not seen on any other server? if you can't tell what this is, basically the world decides it doesn't want to be anymore. and then doesn't is there any particular cause? I know it isn't the plugins that i am using because if i turn them off and don't load them i still get the lag, i have checked for and ddoss and there isn't anything coming in like that.
that is a chunk fail.. (your client did not receive the information from the server for that part of the map) actually, multiple chunks failed.. usually disconnecting and reconnecting makes them go away. i usually see a few of these when i wander around on our server. if you are getting a LOT of them, and you have the lag, then something else may be going on. you would be best served by filling this out (copy the questions, answer them in THIS thread)