Have you checked the graphic settings in the config since you last performed the update? They separated the "general drawing quality" and background into 2 different settings. I know when I originally started up the game I had my graphics set higher than my PC could sustain and DirectX would fail or the game would crash/kick me. After performing some tweaks it runs smoothly now. So make sure your settings aren't pushing your computer into doing more than it can reasonably handle. However, it is possible, that the new way they distributed server load could have created problem areas in other zones of the game, but I know little about how that works so I'll leave it to the experts. As far as network issues, I couldn't tell you, though pre-patch I d/c'd twice while activating a teleport and it still used up my anima
Since the update my game has run alot more smoothly, but then others have seen a downturn in performance. I hope they figure out all these tweaks they are making so everyone can enjoy the game.