Once you're in, the game is perfectly fine. I've only experienced the smallest lag on a handful of quests such as NPCs not walking away immediately.

Getting passed Log in: Savage, on the other hand is a nightmare. Queues are relatively painless between 8-9am EST but once you get to 11am and beyond, good luck. During 3pm onward, it's practically impossible, what with the constant 2002 errors. Frankly, their queuing system is awful. It shouldn't just assume you're AFK when it literally forces you to do nothing. This is definitely something they need to look into improving for future expansions. Long queues are fine. Disappointing but fine... provided you aren't repeatedly disconnected from them.