Pagespeed Facts and Stats shown by Google Chrome's Lighthouse Tool

Pagespeed Facts and Stats shown by Google Chrome's Lighthouse Tool

If you care about SEO at all and you use Google Chrome - then you should be using Lighthouse to automate a bunch of the troubleshooting you do on your client's websites.

The great thing is that it is built into Google Chrome. You just have to right click on a web page, click 'inspect', then select the 'Audits' tab, and finally just click 'Perform an audit...'

Lighthouse will then run a bunch of accessibility, SEO, page rendering, page optimisation and other important tests on that page, and provide you with a nice report to export.

What's cool is that while you wait, it has started to show you interesting facts. The Lighthouse facts I've seen so far are listed below with a link to their source, hopefully you find these useful!

 How to perform an audit using Lighthouse within your Google Chrome Browser.

How to perform an audit using Lighthouse within your Google Chrome Browser.

 

Lighthouse Facts from Think With Google

  • 70% of mobile pages take nearly 7 seconds for the visual content above the fold to display on the screen.
  • 70% of mobile pages weigh over 1MB, 36% over 2MB and 12% over 4MB.
  • As the number of elements on a page increases from 400 to 6,000, the probability of conversion drops 95%.
  • As page load time goes from one second to 3 seconds, the probability of a mobile site visitor bouncing increases 32%
  • As page load time goes from one second to 5 seconds, the probability of a mobile site visitor bouncing increases 90%
  • As page load time goes from one second to 6 seconds, the probability of a mobile site visitor bouncing increases 106%
  • As page load time goes from one second to 10 seconds, the probability of a mobile site visitor bouncing increases 123%

Lighthouse Facts from Google DoubleClick blog

  • 53% of all site visits are abandoned if page load takes more than 3 seconds
  • 19 seconds is the average time a mobile web page takes to load on a 3G connection
  • 14 seconds is the average time a mobile web page takes to load on a 4G Connection
  • The BBC has seen a loss of 10% of their users for every extra second of page load.
  • Rebuilding Pinterest pages for performance increased conversion rates by 15%.
  • Walmart saw a 1% increase in revenue for every 100ms improvement in page load.

 

Lighthouse Facts from WPO Stats

  • By reducing the response size of JSON needed for displaying comments, Instagram saw increased impressions.

 

Lighthouse Facts from WebPageTest and DevTools 3G Definition

  • 1MB takes a minimum of 5 seconds to download on a typical 3G connection

 

Lighthouse Facts from Google Developers Blog

  • If a site takes >1 second to become interactive, users lose attention, and their perception of completing the page task is broken.

 

Lighthouse Facts from International Data Corporation

  • The average user devices costs less than 200 USD

 

Lighthouse Facts from Lighthouse team

  • Lighthouse only simulates mobile performance; to measure performance on a real device, try WebPageTest.org

 

Lighthouse Facts from GSMA Mobile

  • 75% of global mobile users in 2016 were on 2G or 3G.
Hans Rosling's Factfulness Test From His New Book | Questions & Answers

Hans Rosling's Factfulness Test From His New Book | Questions & Answers

New Thameslink Train Routes for 2018

New Thameslink Train Routes for 2018