Your Script Just Killed My Site

This video is presented by Steve Souders, who works on web performance and open source initiatives at Google.  From the YouTube page:

Hiccup. We all get them occasionally. So does the Web. When an Internet or server hiccup causes a script, stylesheet, or font file to timeout, the result can be devastating -- the containing web page is likely to appear completely white for a minute or more. What's worse -- your monitors are unlikely to register this outage. Don't worry -- this probably won't happen to your website. Or will it?