Google offers a variety of web page performance analysis tools to help webmaster know the performance of a web page or a site. Because these tools use different engines to analyze the recommendations from each tool were different, says the search company.
In order to create consistency between these tools, Google is now introducing an update to PageSpeed Insights (PSI) tool announced the company at the 2018 edition of Chrome Dev Summit.
The updated version of the tool now uses Lighthouse as its analysis engine, also it has incorporated field data offered by the Chrome User Experience Report (CrUX) into the tool.
With this update, users can expect the same performance audits and recommendations on the web, from the command line, and in Chrome DevTools.
The update announced today is the first major update since January 2018 when Google began using real user data from the Chrome browser to measure page speed of a site.
From now on PSI will offer the following performance insights:
- Lab Data – PSI uses Lighthouse to simulate how a mobile device loads a page. It computes a set of performance metrics and summarizes data into a score from 0-100 (90 and up is considered good).
- Page metrics include First Contentful Paint and Time to Interactive.
- Field Data – Displays real-world performance metrics for the page and its origins, such as First Contentful Paint and First Input Delay.
- Opportunities – Suggestions to improve the page’s performance metrics along with estimates of how faster the page will load after implementing the suggested improvements.
- Diagnostics – Additional information about how a page adheres to best practices for web development.
Version 5 of the PSI API will now give Chrome User Experience report data along with all the Lighthouse audits.
The Lighthouse category data include performance, progressive web app, accessibility, best practices, and SEO for the test URL.
All earlier versions of the Pagespeed Insights API will be deprecated in over six months.
For more information about the changes, check out this FAQ.
Here is how the updated Google PageSpeed Insights tool looks: