Bad audio at the start, but has great info on making websites faster.
High Performance Web Sites and YSlow (14 Rules)
Even Faster Websites
And a follow on video:
Life's Too Short - Write Fast Code (part 2)
Steve Souder's website:
YSlow (for Firefox)
HTTPWatch (IE, Firefox)
Much of Steve Souder’s argument is that optimizing on the server is great for saving hardware and power consumption, but look first at the front end for perceived performance gains. He’s with Google now after a long stint with Yahoo.
Another video discussing similar issues, but for the mobile environment:
Mobile Web Performance (Guy Podiarny)http://youtu.be/L2YqfVNHQO4