Server lag

As you can see alot of the server lag seems to be coming from user messages!. When there is alot of players online it seems to lag alot and it is fixed for a short time by a restart!
Does anyone know a way of finding out which plugins lag the server or a way of stopping lag?

You could use DBugR to find out what cause this lags

Could be a lot of things. A list of plugins and where the servers hosted, etc more info would help.

I cant get dbugr to work!