I ve encountered client lag also when playing in populated areas, or when doing heroic quests ... abilities queue late, the spells hit with delay, etc. Solo everything is fine. Also my ms is at 100 all the time
near to zero lag on german server kaggath. and the server has ques also.
Since Friday and up until now I have had no long-term lag, no crashes, no DCs, no FPS drops and no screen freezes. I had 1 or 2 5-6s lag spikes at peak hours last night, but that was it. Smoothest beta I have ever been in, especially for an MMO.