The State of Web Performance

Inspired by Steve Souders' recent talk at HTML5 Developer Conference and his related (http://www.stevesouders.com/blog/2013/04/05/page-weight-grows-24-year-over-year-not-44/) blog posts (http://www.stevesouders.com/blog/2013/05/09/how-fast-are-we-going-now/), or organizer Dan DeFelippi will be discussing The State of Web Performance. How has the the web's performance changed over the last year? Is it getting better or worse? What should we be focusing on?