Lately in some of my writing projects I’ve had to hunt down sources to demonstrate the importance of web page speed. Usually a quick Google search will pull up some pretty good ones, and I have a few others on file that I can refer to.
I thought I would put together a roundup of some of the ones I’ve been able to find. Web development bloggers, who are constantly promoting the importance of web page speed, should have these types of authoritative sources at their fingertips.
So consider this post the collective evidence for the importance of page speed. Posts are listed from oldest to newest.
- Google’s Marissa Mayer: Speed wins
Dan Farber, ZDNet (November 9, 2006)
- Page Load Times vs Conversion Rates
Gabriel Svennerberg, In usability we trust (December 18, 2008)
- Amazon: 1% Revenue Increase for Every 100ms of Improvement
- Speed Matters
Jake Brutlag, Google Research Blog (June 23, 2009)
- Bing and Google Agree: Slow Pages Lose Users
Brady Forrest, O’Reilly Radar (June 23, 2009)
- Velocity and the Bottom Line
Steve Souders, O’Reilly Radar (July 1, 2009)
- More on how web performance impacts revenue…
Jesse Robbins, O’Reilly Radar (October 1, 2009)
- Business impact of high performance
Steve Souders, stevesouders.com (October 6, 2009)
- How Loading Time Affects Your Bottom Line
Sean Work, KISSmetrics (April 28, 2011)
- Speed Is A Killer – Why Decreasing Page Load Time Can Drastically Increase Conversions
Sherice Jacob, KISSmetrics (May 10, 2011)
- Page load time – the online business killer
David Mercer, Business Insider (May 24, 2011)
- 4 awesome slides showing how page speed correlates to business metrics at Walmart.com
Joshua Bixby, Web Performance Today (Feb 28, 2012)
- For Impatient Web Users, an Eye Blink Is Just Too Long to Wait
Steve Lohr, NYTimes.com (Feb. 29, 2012)
- How One Second Could Cost Amazon $1.6 Billion in Sales
Kit Eaton, Fast Company (March 15, 2012)
- 37 Lessons I’ve Learned on the Performance Front Lines
Joshua Bixby, Web Performance Today (Oct. 5, 2012)
- Site speed: case studies, tips and tools for improving your conversion rate
David Moth, Econsultancy (October 23, 2012)
- Why Website Speed is Important
Smriti Chawla, Six Revisions (April 2, 2014)
- Research: Site Speed Is Hurting Your Everyone’s Revenue
Ian Lurie, Portent (May 9, 2014)
If you know of any other good sources that discuss why page speed matters, add them to the comments and I’ll continually update this post. And keep in mind, these are sources that show why page speed matters not how to make pages faster.
So if you’re heading to a client meeting or want to discuss with your boss why it’s wrong to polyfill some CSS3 or HTML5 feature so it works in IE6/IE7/IE8, this might be a good way to show the potential effects of slowing down the slowest browser.