Surface/Win RT/Modern UI performance issues [Update]

Performance issues with the latest updates installed.
What do you guys think?


Update: Whether you like Chris Pirillo or not I think he is giving his honest impressions about the device.

Lets not talk about him but rather the issues he points out.

What is the cause for the lag/stutter? Having open more than 2 or 3 apps in the background? (Although I think he only had 2 apps open in the background)