Came to the comments looking for these links, too. Results of my research are below; everything I found is anecdotal, consistent with the other comments. The

Came to the comments looking for these links, too. Results of my research are below; everything I found is anecdotal, consistent with the other comments. The most robust is the presentation at Velocity in 2009. [4, 5] My notes: Small ecommerce vendor, 2012. One second delay in page-load causes 7% loss in customer conversions. [1] Marissa Meyer, 2006 Web 2.0 conference. Extra 1/2 second in page load time dropped traffic by 20%. [2] Greg Linden, 2006 (same link as above) "We had similar experience at Amazon.com. We tried delaying page in increments of 100ms and found very small delays result in substantial and costly drops in revenue. [2] Greg Linden, Make Data Useful, 2006 - Every 100ms delay costs 1% of sales. [3] Velocity, 2009. The User and Business Impact of Server Delays, Additional Bytes, and HTTP Chunking in Web Search Presentation. Multiple observations. My net: Delays under 500m measurably impact customer satisfaction metrics, magnitude increases commensurately with delay. (Microsoft, Amazon, Google) [4, 5] 1 - https://info.ensighten.com/rs/ensighten/images/just-one-second-delay-in-page-load-can-cause-7-percent-loss-in-customer-conversions.pdf https://info.ensighten.com/rs/ensighten/images/just-one-seco... 2 - http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20.html http://glinden.blogspot.com/2006/11/marissa-mayer-at-web-20.... 3 - http://www.gduchamp.com/media/StanfordDataMining.2006-11-28.pdf http://www.gduchamp.com/media/StanfordDataMining.2006-11-28.... 4 - http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-pag.html http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-... 5 - http://conferences.oreilly.com/velocity/velocity2009/public/schedule/detail/8523 http://conferences.oreilly.com/velocity/velocity2009/public/...