Google has defined a set of metrics that site owners should focus on when optimizing user experience.

By defining these Core Network Vitalers, Google strives to provide consistent guidance on the qualitative signals that Google believes are necessary to provide an excellent online user experience.

“Optimizing the quality of the user experience is the key to the long-term success of any website.

Whether you’re a business owner, marketer, or developer, Web Vitals can help you define your site’s user experience and identify opportunities for improvement. “

Google emphasizes the importance of Core Web Vitals over other metrics because they are important to any online experience.

Users ’expectations of the online experience may vary depending on the site and context, but some remain consistent no matter where they are online.

Core Web Vitals are user experience needs that all websites should strive to meet.

Here’s how Google identifies the core needs of the user experience: Loading, interactivityand visual stability.


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This is how user experience needs are measured.

Measuring the user experience with Core Web Vitalies

Google says that site owners can measure the quality of the user experience on their site with the following data:

  • The biggest content goal: The time it takes for the main content of a page to load. The ideal LCP measurement is less than or equal to 2.5 seconds.
  • First income delay: The time that the page becomes interactive. The ideal measurement is less than or equal to 100 ms.
  • Cumulative layout transfer: The amount of unexpected layout change in the content of the visual page. The ideal measurement is less than or equal to 0.1.

Google explains why these three metrics in particular are so important:

“All of these metrics collect important user-centric results, are field measurable, and are supported by metric equivalents and tools for laboratory research.

For example, while the largest content target is the upline load information, it is also highly dependent on the first content target (FCP) and time to first byte (TTFB), which are still critical for tracking and improvement. “


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Related: Googler explains usability and user experience ranking factors

How to measure core networks

Google is integrating Core Web Vitals measurement capabilities into many of its existing tools.

Core Web Vitals can now be measured using:

  • Search Console.
  • PageSpeed ​​Insights.
  • Lighthouse.
  • Chrome DevTools.
  • Chrome UX report.
  • Web Vitals plugin.

Here is more information on using these tools to measure Core Web Vitals.

Search Console

How can you measure core networks

The Search Console includes a new Core Web Vitals report that helps site owners evaluate pages across the site.

The report identifies page groups that require attention based on actual data in the Chrome UX report.

Please note with this report that URLs will be excluded if they do not have the minimum amount of reporting information.

PageSpeed ​​Insights

PageSpeed ​​Insights has been upgraded to use the Lighthouse 6.0 operating system, allowing it to measure the Core Web Vitals report in both the laboratory and field sections of the report.

Core Web Vitals are marked with a blue ribbon, as shown below.

How can you measure core networks


Lighthouse was recently upgraded to version 6.0, which included additional checks, new gauges, and newly developed performance points.

How can you measure core networksHow can you measure core networks

Two of these new variables are Largest Contentful Paint (LCP) and Cumulative Layout Shift (CLS).


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These metrics are laboratory implementations of Core Web Vitali and provide diagnostic information to optimize the user experience.

The third new metric – Total Blocking Time (TBT) – is said to correlate well with the first entry delay (FID), which is the second Core Web Vitals meter.

All products in Lighthouse products have been updated to the latest version.

Chrome UX report

This report, also known as CrUX, is a public data set of real user experience data on millions of websites.

The Chrome UX report measures the field versions of all Core Web Vitals, which means it reports real-world data instead of lab data.

Google has recently updated the report on the new Core Web Vitals landing page.

How can you measure core networks

The report is accessible here.


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Chrome DevTools

Chrome DevTools has been updated to help site owners find and fix visual instability issues on a page that may affect Cumulative Layout Shift (CLS).

How can you measure core networks

Click Layout Change to see its details on the Summary tab. To see where the change occurred, hover your mouse over the Moved and Moved fields.

Chrome DevTools also measures total blocking time (TBT), which is useful for improving the first entry delay (FID).


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TBT now appears in the footer of the Chrome DevTools Performance panel when you measure page performance.

How can you measure core networks

Performance optimization that improves TBT in the laboratory should also improve FID.

Web Vitals plugin

The new extension, now available for installation from the Chrome Web Store, measures three Core Web Vitals data in real time.

How can you measure core networks

You can download and install the plugin here.

What about other valuable metrics?

As important as Core Web Vitals are, they are not only user experience metrics to focus on.


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As Google improves its understanding of the user experience, it updates its Core Web Vitals annually.

Google will also provide updates on upcoming Web Vitals candidates, the motivation for their selection, and the status of implementation.

At least so far, the company has invested heavily in improving page speed comprehension:

“From 2021 onwards, we will invest in measuring better understanding and ability to measure page speed and other critical user experiences.

For example, extending the ability to measure input delays in all interactions, not just the first; new indicators to measure and quantify uniformity; primitives and supporting metrics that allow immediate and privacy-enhancing experiences to be delivered online; and more. “

Image credits: Paulo Bobita


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