I disagree. If all I wanted to do with my PC is surf the web, check email, chat with friend and use office apps like the "average" computer user does, I'd switch to linux in a heart beat, in fact, I did for a while. But the one thing that keeps me bound to this monopoly that is Windows is gaming, which goes back to application availability.
I don't think what the article is saying is true at all. I ran linux for months and didn't notice any of this "slow speed" in fact, it ran faster than windows, if anything. Even for games running through Wine.