except that horrible 1 minute freeze in the 10th anniversary quest i did before eastern, i haven't experienced anything really bad.
there was a little lag-spike now and then, like the whole evening it occured once or twice over the last few days.
after the latest downtime i haven't experienced any lag-spike so far.
EDIT: the super lag spike before eastern wasn't comming with a packet loss, i remember this, cause i was looking at the connection icon, and it didn't say anything about packet loss. i thought this was odd.
only the latency went really high, like 1200ms and more.