Please read the associated blog post that went along with the site. http://www.zachleat.com/web/manifesto/

"I’ve been reluctant to share the slides because I certainly don’t want developers to take them as dogmatic truth. Rather, I’d love for people to see a forest using trees they’ve planted themselves."

Certainly scrolling could be improved. I'll definitely look into improving the performance. I honestly had no idea this slide deck would get this much attention.