Lag/net bandwidth consume can be reduce by:
On Cloud City player can hide and show.
do a same thing like that on
1. Battle Ground (hide / show same side)
2. World Boss (hide / show)
3. Amethyst (hide / show same guild) never attack same guild
4. Battle Ground / Arena matching system criteria should fix
5. Teleport City to other MAP on wild MAP button disabled after (need reload to enable again)