Some of the perceived lag this weekend is probably server-side.
I also have ability-delay here and there while my latency is "ok" (for EU) between 120-170ms.
Cougar came on with a <realm> message in the first half-hour of the servers going up welcoming everyone and saying they were breaking concurrency records every minute (obviously their own previous beta weekends concurrency records).
If that happened in the first half hour of the servers going up one can only imagine what's happening later.