I am from eu, but i am not here for blaming this kind of lag. This just cause me Npc slow response and slow loading.
however, today, now, it finally has the roll back lag which mean when i hit mob it doesn’t drop hp for few sec and also I walk will be return to few secs before. This result in wasted 1 hour to done a quest. Yes, a quest for 1 exp card, i spent 1 hour for killing mob and walking. Luckily, I am not killed by boss, but I have spend almost half hour to kill it hahahahahaha.
Hope you improve the server quality. THANK YOU!