The highlight of this article for me is: Amazon: 100 ms of extra load time caused a 1% drop in sales (source: Greg Linden, Amazon). Google: 500 ms of extra

The highlight of this article for me is: Amazon: 100 ms of extra load time caused a 1% drop in sales (source: Greg Linden, Amazon). Google: 500 ms of extra load time caused 20% fewer searches (source: Marrissa Mayer, Google). Yahoo!: 400 ms of extra load time caused a 5-9% increase in the number of people who clicked "back" before the page even loaded (source: Nicole Sullivan, Yahoo!). Answered my own question but will leave for anyone else interested: but does anyone have the sources for those facts? edit: Original source for Amazon stat (possibly also Yahoo, or possibly it's just referenced) is a powerpoint by Greg, downloadable at http://7303294208304035815-a-1802744773732722657-s-sites.googlegroups.com/site/glinden/Home/StanfordDataMining.2006-11-29.ppt http://7303294208304035815-a-1802744773732722657-s-sites.goo... edit 2: The Google stat is from a speech at a 2006 "Web 2.0" conference, referenced by Greg at http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20.html http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20.... edit 3: Yahoo stat from Nicole's presentation here: http://www.slideshare.net/stubbornella/designing-fast-websites-presentation http://www.slideshare.net/stubbornella/designing-fast-websit...