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1 | # web-performance-anecdotes
2 | Anecdotes about how web performance affects products.
3 |
4 | **NOTE:** Please check out https://wpostats.com/ and https://pwastats.com for many more performance statistics.
5 |
6 |
7 |
8 | > Every 100ms of additional latency costs Amazon 1% in profit.
9 |
10 | http://radar.oreilly.com/2008/08/radar-theme-web-ops.html
11 |
12 |
13 |
14 | > Yahoo! saw a 5-9% decrease in page traffic when the site was 400ms slower.
15 |
16 | https://www.slideshare.net/stoyan/dont-make-me-wait-or-building-highperformance-web-applications
17 |
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19 |
20 | > 53% of mobile site visits are abandoned if pages take longer than 3 seconds to load
21 |
22 | https://www.doubleclickbygoogle.com/articles/mobile-speed-matters/
23 |
24 |
25 |
26 | > Etsy.com discovered that 160KB of additional images caused their bounce rate to increase 12% on mobile devices.
27 |
28 | https://www.sitepoint.com/average-page-weight-increased-another-16-2015/
29 |
30 |
31 |
32 | > Test results showed that for every one second increase in speed, our engagement score increased by 5%.
33 |
34 | http://www.inma.org/blogs/ideas/post.cfm/financial-times-increases-engagement-with-personalisation-speed
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36 |
37 |
38 | > 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
39 |
40 | http://www.phpied.com/the-performance-business-pitch/
41 | https://conferences.oreilly.com/velocity/velocity2009/public/schedule/detail/7709
42 |
43 |
44 |
45 | > GQ cut its page load time by 80% and saw a 108% increase in ads interaction rate
46 |
47 | https://digiday.com/media/gq-com-cut-page-load-time-80-percent/
48 |
49 |
50 |
51 | > 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.
52 |
53 | https://www.smashingmagazine.com/2017/03/world-wide-web-not-wealthy-western-web-part-1/
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57 | 
58 |
59 | http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-pag.html
60 |
61 |
62 |
63 | > 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%
64 |
65 | https://research.googleblog.com/2009/06/speed-matters.html
66 |
67 |
68 |
69 | > Page-load performance increased by over 30%, and average time-per-session increased 10% across all browsers
70 |
71 | https://developers.google.com/web/showcase/2016/housing
72 |
73 |
74 |
75 | > 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.
76 |
77 | http://radar.oreilly.com/2009/06/bing-and-google-agree-slow-pag.html
78 |
79 |
80 |
81 | > 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.
82 |
83 | https://blog.codinghorror.com/performance-is-a-feature/
84 | https://blog.codinghorror.com/speed-still-matters/
85 |
86 |
87 |
88 | > 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%.
89 | >
90 | > * 25% higher revenue per article pageview
91 | > * 4X faster average page-load speed
92 | > * 43% longer average time on site
93 | > * 34% more page views per session
94 | > * 24% lower bounce rates
95 |
96 | https://developers.google.com/web/showcase/2017/mynet
97 |
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