UPDATE (09/14/2012): The guide has been updated after Blizzard decided to let everyone access the Diablo III Starter Edition. Furthermore, I have verified without doubt that the extreme and casual slowdowns I talk about in the post are ascribable to the software configuration used to test the game and not to the game itself (or to my hardware, luckily).
Yeah, I now, I’m late as usual: Diablo III was released two months ago, and I have already talked enough about the almost complete failure of the launch period. So why devoting a post to the demo version of the game when almost everyone has already read, seen and done what there was to read, see and do in the cursed lands of Sanctuary? For two reasons, the first of which is that after having extensively played the Starter Edition I have a weight on my chest that I need to let go.