The new Core Web Vitals SEO elements

Google introduces 3 new SEO factors in 2021 (Core Web Vitals)

Wouter De Bruycker

Starting next year, King Google will take 3 new factors into account to determine the position of your website in the Google search results.

In this article you will discover which SEO factors are involved and how to prepare for them.

Last update: 18th of January 2021


What are the new SEO factors (Core Web Vitals)?

The new SEO factors (which Google announced in May 2020) are summarized under the heading Core Web Vitals.

Core Web Vitals are metrics that measure the quality of your user experience (UX).

They indicate whether these UX-factors are good or bad and whether they influence your position in Google positively or negatively.

When does Google start taking the Core Web Vitals into account?

Google will start in May 2021 with the rollout of the Core Web Vitals in the ranking algorithms.

Update 18/01/2021: John Mueller (search advocate and webmaster trends analyst at Google) confirmed the rollout of these new page experience signals will be a global update at the same time.

Google will probably do some testing in advance to make sure the rollout in May of 2021 goes smoothly, so some websites might already notice some position changes before this date.

What are the components of the Core Web Vitals?

The Core Web Vitals currently exist out of tree components:

  • LCP
  • FID
  • CLS

Let's explain them in human language...


LCP is short for Largest Contenful Paint and measures how quickly the largest (initially visible) element on your web page is loaded.


FID is short for First Input Delay. It indicates how quickly a page is "usable" and responds to user input (time to interactive).


CLS is short for Cumulative Layout Shift and measures the visual stability of a web page.

An example of a low visual stability is a page in which parts of the page move from one place to another as soon as other elements (such as images) are loaded.

What are the Core Web Vitals not?

Core Web Vitals are not a magical solution for all your SEO problems. A good score will not automatically lead to a top ranking in Google search results.

The Web Vitals are part of a broader picture and come on top of other SEO factors such as authority, content and general technical setup of your website such as https and responsiveness. (read more about the basics of your SEO)

Core Web Vitals: part of the Page Experience factors

Image: Page Experience SEO signals (source: Google Search Central)

Will the Core Web Vitals change in the future?

No doubt. The current UX signals are not set in stone and will certainly be expanded in the future.

“To improve our understanding of user experience going forward, we expect to update Core Web Vitals on an annual basis”

Ilya Grigorik, Google Web Performance Engineer

How do you check the Core Web Vitals yourself?

There are several possibilities to easily check the Core Web Vitals of your pages yourself.

Depending on your job function you will be best served with the tools below:

  • Webmaster? Check the Core Web Vitals report in your Google Search Console property
  • Content editor? Test your page via Googles PageSpeed Insights tool
  • Developer? Then you probably want to use the Chrome Lighthouse plugin.

    Thanks to Lighthouse you can even see how much influence each factor has on the final Performance score.
Detail view of the Lighthouse Performance score

Screenshot: Lighthouse detail view of the Performance score

For everyone else: Google PageSpeed Insights is the most easy-to-use tool to get a high-level overview of your Core Web Vitals score.

How to improve the Core Web Vitals of your website?

There are a lot of different ways to optimize the Core Web Vitals of your website.

Listing them all here would be unnecessary, because Google itself has already written some excellent articles about them.

Consult the links below for an in-depth technical explanation of...

Not familiar with development and optimization?

Get in touch with us if we can have a closer look at your website.

Why is this important for your website?

New ranking factors mean you might have to technically update your website to be in line with these new requirements.

Google also confirmed it will be running experiments with visible labels on the search results page, to highlight pages that score well on these new SEO factors.

“In addition to the timing updates described above, we plan to test a visual indicator that highlights pages in search results that have great page experience." (1)

Icons or badges like these could definitely improve the click-through-rate to your website (or the CTR may decline if your pages perform badly).

In summary

What the Core Web Vitals measure (UX signals) is not completely new.

Improving the user experience of a website is something that has been happening longer than today, but Google is now making it more concrete (and more important) than ever.

The reason for this is two-fold:

  1. The proportion of mobile internet users is still growing, which means the loading speed remains extremely important.

    Even though the Core Web Vitals apply to both desktop and mobile, the emphasis is on mobile internet users (as they usually surf at a lower speed).
  2. More and more content of very good quality is appearing online every day. With very similar content, the user experience can be the distinguishing factor.

Because of this new emphasis on technical factors, it is now more important than ever to let developers work closely with SEO specialists to find the right future-proof solution.

Want to know more? Contact us for a free brainstorm session.




  1. Timing for bringing page experience to Google Search - Google Search Central Blog - (18/1/2021)



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