While the server is down, I'm gonna blog about an issue I found in my Optimus-enabled laptop. For those who don't know, Optimus is a technology by Nvidia that allows the laptop to shift between the discreet video card and the built in intel video card in real-time depending on the need of the system in order to save on precious battery life.
The issue is Diablo III doesn't use the Nvidia card and continues to use the Intel card resulting in poor performance. I've verified this using GPU-Z. I was surprised that even the login screen is choppy / laggy.
The workaround: Right click the Diablo 3 icon / executable > Run with graphics processor > Select Nvidia card. This significantly increased the performance of the game.
If you don't see the option "Run with graphics processor" option in your context menu, go to Nvidia Control Panel, click "View" menu then select "Add Run with graphics processor to context menu" option.
Nvidia 310M Optimus / Intel GMA HD
[update] For those experiencing crash, lockups, freeze, hangs in UL80JT. Try to update your BIOS to version 215.