What do low rate, mid rate and high rate mean?

These are rough classes of servers by experience rate. Low rate means slow levelling and an economy close to the official one. Mid rate levels faster, but crafting and farming still matter. High rate gets a character to a high level fast, and the game is about PvP and sieges.

There is no exact boundary, and sites draw it differently. On L2OKO the collections are: Low rate up to x10, Mid rate from x11 to x99, High rate from x100.