And, of course, the nerf of Nagle's Algorithm. What? You haven't heard of the beast? It roams the land killing unsuspecting adventurers through its almighty lag inducing abilities. Actually, It's a method of handling information packets across the Internet. Applying it makes for slower, more efficient packet transmission, but for online games that require constant communication, it can cause lag. Bad, naughty, slideshow of death lag. Ok, not that bad, but removing it will increase responsiveness of the game. And that doesn't suck.
Class over. PTR's are up. Log in on those pre-mad- uh, with your transferred mains and their hard earned and well-deserved equipment to test it out.