I dont know if this is already been suggested yet but Its worth a try.
I like to suggest a vending separation,
For example:
Naila Village Ch 1 - Rouge Items
Naila Village Ch 2 - Mage Items
Naila Village Ch 3 - Fighter Items
Naila Village Ch 4 - Item mall Items like 100% Exp scrolls,Lucky boxes etc.
This helps our server to be more arranged and this might help to reduce lag, Due to over crowded channels like ( Nv 3 Lol Always crowded but Nv 1, Nv 2 is smooth )
Have a nice day :D Look forward to this suggestion :))