Backer,
I raid about 15 hours a week, so I'm well aware of the server lag issues. Some zones are worse than others, and some nights are worse than others. It's my goal to start putting some time into looking at these issues to see what we can do to resolve them. Unfortunately reproducing lag in a dev environment isn't easy. Most likely this will involve us doing some real-time profiling on live servers.
It's definitely something we are aware of and planning on looking into. We're also still looking at client performance issues because we know its a hot topic, especially among people with multi-core machines and high-end video cards.
LINK