Didn't we just have a huge thread on how to fix this? In any mmorpg like this there will always be a central hub. ppl need a place to hang out,recruit ppl,join a group,and advertise. I agree with the other guys there isn't any way currently to fix the lag causing graal city. I think random "purges" at fairly frequent intervals would help,or random baddie swarm attacks.
Also when the rail road system returns if it is more efficient as we have been lead to believe,And if becomes even easier to travel around that may help as well. I can all ready tell there is going to be idlers inside the rail road station.
Otherwise I think we are just going to have to live with the lag till they upgrade or get a bigger better server. I'm sure towards the end of next month when school resumes the online player count will drop dramatically and the lag will decrease.