If you haven’t already used Google’s PageSpeed Insight tool, then you need to re-evaluate your SEO efforts immediately. The tool shows you how fast (or not), your pages are loading. As we all know, page speed is critical for user satisfaction and, of course, good SEO results.

Now things are getting interesting as Google rolls-out a change to the PageSpeed Insight tool, allowing the speed results to come from actual data from Chrome Users.

Google grade each page depending on which third they fall into (Fast = fastest third, Medium = medium third, Slow = slowest third).

According to Google, the PSI report now has several different elements:

  • The Speed score categorizes a page as being Fast, Average, or Slow. This is determined by looking at the median value of two metrics: First Contentful Paint (FCP) and DOM Content Loaded (DCL). If both metrics are in the top one-third of their category, the page is considered fast.
  • The Optimization score categorizes a page as being Good, Medium, or Low by estimating its performance headroom. The calculation assumes that a developer wants to keep the same appearance and functionality of the page.
  • The Page Load Distributions section presents how this page’s FCP and DCL events are distributed in the data set. These events are categorized as Fast (top third), Average (middle third), and Slow (bottom third) by comparing to all events in the Chrome User Experience Report.
  • The Page Stats section describes the round trips required to load the page’s render-blocking resources, the total bytes used by the page, and how it compares to the median number of round trips and bytes used in the dataset. It can indicate if the page might be faster if the developer modifies the appearance and functionality of the page.
  • Optimization Suggestions is a list of best practices that could be applied to this page. If the page is fast, these suggestions are hidden by default, as the page is already in the top third of all pages in the data set.

It is worth noting that not all sites will be graded using this method. You need enough traffic from Chrome users to get an accurate picture here.