Yes. That's because the seabone (AKA international link) from Argentina to the rest of the world sucks.
So that kind of lag will be there all the time. Can't fix that unless i get a satellite link (which is ~2x more expensive for 1/2 the speed), or server is mounted elsewhere.
For what I've seen tonight, every time some player initiated a fight with many NPC, traffic increased 2x.
That is because the server transmits the info on the location of many objects to all players.
(If you find any mistake in my English, please let me know via a PM)
(Really, I speak terrible English, so please, tell me if I make mistakes. I'd like to improve it a bit )