I don't see anything wrong. No spikes on the bandwidth graph and the server is half empty so it can't be a cpu problem.
 
The lagspikes dropped about four minutes after I sent this in, I thought you found a bug and fixed it. But this has been going on a good fourty five minutes or so. I've seen lots of people up and freeze midair with their pings around eight hundred, I don't know the cause but something's really weird with the server.
 
I know that when Red! ('monkey) one of the guys I banned awhile back, connects to the server. It tends to lag a fair amount. I sent Creeping a demo of !Red joining the server and the server then skyrocketing everyone's pings to around five hundred. I honestly don't know if it's connected but I think it might be.