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https://github.com/mknichel/web-performance-anecdotes

Anecdotes about how web performance affects products
https://github.com/mknichel/web-performance-anecdotes

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Anecdotes about how web performance affects products

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# web-performance-anecdotes

Anecdotes about how web performance affects products.



**NOTE:** Please check out https://wpostats.com/ and https://pwastats.com for many more performance statistics.






> Every 100ms of additional latency costs Amazon 1% in profit.



http://radar.oreilly.com/2008/08/radar-theme-web-ops.html







> Yahoo! saw a 5-9% decrease in page traffic when the site was 400ms slower.



https://www.slideshare.net/stoyan/dont-make-me-wait-or-building-highperformance-web-applications







> 53% of mobile site visits are abandoned if pages take longer than 3 seconds to load



https://www.doubleclickbygoogle.com/articles/mobile-speed-matters/







> Etsy.com discovered that 160KB of additional images caused their bounce rate to increase 12% on mobile devices.



https://www.sitepoint.com/average-page-weight-increased-another-16-2015/







> Test results showed that for every one second increase in speed, our engagement score increased by 5%.



http://www.inma.org/blogs/ideas/post.cfm/financial-times-increases-engagement-with-personalisation-speed







> Shopzilla redesigned their site and went from page loading times around 6 seconds down to 1.2 seconds. As a result all metrics improved. The revenue increased with 7 to 12%, they got 25% more page views



http://www.phpied.com/the-performance-business-pitch/

https://conferences.oreilly.com/velocity/velocity2009/public/schedule/detail/7709







> GQ cut its page load time by 80% and saw a 108% increase in ads interaction rate



https://digiday.com/media/gq-com-cut-page-load-time-80-percent/







> This is important because the average web page (page, not full app or website) is 2.3 MB, of which 1.6 MB are images…. In Germany, buying an entry-level mobile data plan of 500 MB per month takes one hour of work at minimum wage. In the US, it takes six hours, and in Brazil, it takes 34 hours of work.



https://www.smashingmagazine.com/2017/03/world-wide-web-not-wealthy-western-web-part-1/







![analytics chart](http://cdn.oreillystatic.com/radar/images/2009/06/200906221737-tm.jpg)



http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-pag.html







> Our experiments demonstrate that slowing down the search results page by 100 to 400 milliseconds has a measurable impact on the number of searches per user of -0.2% to -0.6%



https://research.googleblog.com/2009/06/speed-matters.html







> Page-load performance increased by over 30%, and average time-per-session increased 10% across all browsers



https://developers.google.com/web/showcase/2016/housing







> Bing ran a test where they sent down their easy-to-compute-and-serve header before they sent down their results. They used Chunked Transfer Encoding to deliver the bits. This resulted in more user engagement presumably due to the immediate visual response.



http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-pag.html







> In A/B tests, [Amazon] tried delaying the page in increments of 100 milliseconds and found that even very small delays would result in substantial and costly drops in revenue.



https://blog.codinghorror.com/performance-is-a-feature/

https://blog.codinghorror.com/speed-still-matters/







> After launching a Progressive Web App (PWA) that uses Accelerated Mobile Pages (AMP) for content, they saw a 4X decrease in average page load times. In addition, Mynet saw a significant increase in user engagement, with the average time spent on their mobile site rising 43%.

>

> * 25% higher revenue per article pageview

> * 4X faster average page-load speed

> * 43% longer average time on site

> * 34% more page views per session

> * 24% lower bounce rates



https://developers.google.com/web/showcase/2017/mynet