While the connectivity and general lag seems to have gotten better in the last day or so, there are still some lingering issues here and there. All servers will be undergoing rolling restarts on the morning of the 24th from 5:00 a.m. PDT to 6:00 a.m. PDT. Each realm is expected to be down only 15 minutes.
Ideally this will solve all the issues we've had since patch 3.0.2 hit last week, but more likely we'll just see things be better for a short time.
If this temporary down time turns into anything extended, we'll update this post.
Of course, this restart might have something to do with Zombies hungry for brains.