What are the most important aspects of the web?

Core Web Vitals (CWV)

CWV are a collection of quantifiable performance indicators established by Google to quantify the quality of user experiences on a website. Web page content is evaluated using measures such as loading time (LCP), interaction (FID), and visual stability (CLS).

Since its inception, Google has prioritised the needs of its users above everything else. They've worked for a better user experience from removing keyword stuffing to making website load speed a ranking criterion, to mobile-first ranking. This is only the latest step in that direction.

Discover the importance of Core Web Vitals and how to raise the corresponding web page scores by reading on.

A list of the book's sections.

What are the most important aspects of the web?

Core Web Vitals (CWV)

CWV are a collection of quantifiable performance indicators established by Google to quantify the quality of user experiences on a website. Web page content is evaluated using measures such as loading time (LCP), interaction (FID), and visual stability (CLS).

Key Points

  • Google's Page Experience Signals comprise three metrics called Core Web Vitals that measure the user experience of a page.
  • The speed at which a page is displayed, the time it takes before a user may interact with it, and the visual stability of the page's parts are all measured by the Core Web Vitals.
  • It's not clear how long it will take Core Web Vitals to implement the metrics that make up LCP, First Input Delay (FID), and Cumulative Layout Shift (CLS).

In May 2020, Google revealed that page experience signals would be incorporated into organic search rankings. For the purpose of calculating the overall user experience, Google's algorithm will start measuring the parameters listed below.

Is mobile friendly?

  • Convenient on-line shopping
  • Lack of obtrusive interstitials (pop-ups) improves content accessibility 

Three new indicators named Core Web Vitals will be introduced to Google's page experience signals in November 2020:

  • The Biggest Contentful Paint (LCP)
  • Delay in the initial input of data (FID)
  • Layout shift in the aggregate (CLS)

When was Core Web Vitals released? 

As part of a page experience upgrade that will take place at the end of August, Core Web Vitals became a Google ranking criteria for top articles on Thursday, June 17. Google, on the other hand, has said that they would be updating its page experience metrics every year. As a result, anticipate things to change over time.

The importance of Core Web Vitals

What is the significance of Google Core Web Vitals? Because they aid in the creation of a positive user experience for visitors. As a consequence, customers are happier, more inclined to return, and more likely to spread the word about your website to their friends and relatives. Users are less likely to return if the pages are unresponsive, unreliable, or overrun with pop-ups.

Consider the ramifications for Google's image and bottom line. You'll get annoyed with Google if you keep clicking on links in the SERP that don't give what you expected. There is a risk that Google will lose advertising income if you switch to another search engine in the future.

Google Core Web Vitals are SEO performance metrics that offer you a sense of how your website is seen by visitors. They offer you with particular, quantifiable data that you can utilise to enhance your website's overall user experience. Users are more inclined to return to a site if they had a positive experience.

CWV isn't only about improving your organic search rankings, but it is a significant component of it. It gives a better experience for your viewers. More engaged clients, improved conversion rates, and maybe other beneficial outcomes are all a result of this increased attention.

Core Web Vitals are vital, but Google also looks for "the greatest information overall, even if the page experience is substandard" when ranking pages.

The quality of the content on a website cannot be trumped by the user experience. However, if there are a lot of sites with comparable content, page experience might have a significantly greater impact on search engine rankings.

Core Web Vitals consists of the following three components: 

Each of the three Core Web Vitals components, including thresholds and target areas, will now be examined in further detail.

LCP: The Largest Contentful Particle

Biggest and Most In-depth Painting (LCP)

The LCP statistic measures the time it takes for a page to load in Core Web Vitals. To put it another way, it measures how long it takes to produce the biggest piece of content on a user's display. Not the complete page is counted.

According to the website, this might be one of several things:

  •  Featured photo.
  • H1
  • Tables of contents
  • element with a picture in it
  • SVG element with an image> element inside of it
  • A video element with an image inside of it.
  • The url() method is used to load the background image.

Having an LCP of less than 2.5 seconds is considered a "excellent" URL by Google (segmented by mobile and desktop). Needs improvement: A score between 2.5 and 4 seconds. Overachieving is defined as a time that exceeds four seconds.

What can you do to raise your LCP score? Google's LCP optimization overview is a good place to start.

Improve your LCP score with these tips.

Remove any third-party scripts that aren't needed.

  • Make the switch to a more rapid web host
  • Setup a Content Delivery Network (CDN)
  • Cache resources
  • Set up pictures to load more slowly.
  • Loading time is slowed down by huge page items (large images, GIFs, etc.)
  • Reduce the size of your CSS
  • Follow Google's recommendations for your URL (See how to measure Core Web Vitals below.)

First Contentful Paint (FCP) and Time to First Byte (TTFB) are two more closely related metrics to take into account when evaluating difficulties with page performance (TTFB).

FID: Initial Delay in Input

Fast Interaction Delay (FID) is an important Core Web Vitals indicator. Specifically, it measures the time it takes for a web page to respond to the initial user input (clicking, tapping, swiping, etc.)

Think of page responsiveness as interaction. The more time it takes for a website to respond, the more annoyed a user will be.

What does a high FID score mean?

It is considered "good" by Google if the FID is less than 100 milliseconds long. 75 percent of the time, acquired field data from mobile and desktop must be met by a page.

What's the best place to start? Google's FID optimization overview is a good place to start.

What you can do to raise your FID score

To make it easier for your visitors to engage with your site, reduce (or delay) the use of JavaScript.

Before a user may engage with your site, remove unnecessary third-party scripts (heat maps, analytics, etc.)

Utilize browser caching to avoid having to refresh pages every time a user visits your site.

Follow Google's recommendations for your URL (See how to measure Core Web Vitals below.)

Cumulative Layout Shift is the name given to this feature.

Defintion of CLS (cumulative layout shift)

In the Core Web Vitals metrics, CLS is a measure of how well-functioning a page is visually. The amount of screen space that changes and the distance that objects travel are taken into account.

Trying to engage with website components that move about suddenly is one of the most aggravating things. Unexpected layout changes may be particularly troublesome if they have real-world effects, such as unintentionally placing a purchase or clicking on an ad that redirects you to another website.

Real-world user interactions, not lab data, should be used when calculating CLS for a website. Ads might not load on your staging site, thus your scores won't be accurate.

Using the impact fraction and distance fraction, we can get CLS from a viewport shift (movement distance divided by the viewport height).

This occurs when there is less than one second between each layout shift, with a total of five seconds or fewer between each shift. Over the course of a page's lifecycle, CLS measures the biggest burst of layout changes. You may get more information on how this is determined in Google's documentation, which is available here.

In order to achieve a decent CLS score, a page must achieve it 75% of the time on both mobile and desktop.

What's the best place to start? Review Google's CLS optimization overview for a good place to start.

Your CLS score can be improved by following these steps.

In order to ensure that the browser doesn't unexpectedly modify the dimensions of any media (e.g., photos, GIFs, etc.), set the size property dimensions.

Put all advertising in designated areas so that they don't disrupt the flow of the page and cause the content to be shifted unexpectedly.

Avoid using pop-ups or banners that cause the layout of the screen to vary when the site initially loads up.

Follow Google's recommendations for your URL (See how to measure Core Web Vitals below.) 

Core Web Vitals Measurement Tools

You may use a variety of tools to evaluate your site's Core Web Vitals scores to the specified standards.

Google's software

You may use Google Search Console's Core Web Vitals report (located under the Experience tab) for this. Your URLs will be classified as "good" or "bad" based on their performance on mobile and desktop devices. Take note that the data is a little sluggish at the moment.

In the "PageSpeed Insights" section, you may see specific suggestions on how to enhance the overall page experience after clicking on a specific URL in the address bar. (Or, if you want, you may click directly to Google PageSpeed Insights). Optimizing picture size to improve loading time will be one of several basic tips. Others will be more difficult, forcing you to delve deeper into the code of your site in order to minimise the amount of useless JavaScript or remove resources that are rendering.

This is a page performance tool that is particularly beneficial to web developers, as it incorporates audits that Google PageSpeed does not offer.

You may enter any URL on your site into Google Web.Dev and obtain advice for enhancing Core Web Vitals and basic best practises for improving the overall user experience.

Chrome DevTools performance statistics now displays Core Web Vitals data starting with Chrome 88 and above. An overlay tool has been included in Chrome since version 90.

Use the Chrome User Experience Report as an additional resource (CrUX).

web-based lifelines Google Chrome add-on

Using the Web Vitals Chrome plugin, you can quickly and easily determine if any page fulfils Google's Core Web Vitals standards. Be warned, however, that the extension was not created by Google.


It is possible, however, that your CMS offers further customization choices. Third-party plugins, such as WP Rocket, NitroPack, or Asset Clean Up, can significantly enhance Core Web Vitals speed if your site is based on WordPress.


You may use Google's Lighthouse DevTool to measure any page's CWV scores directly from your Chrome browser. The Lighthouse tab may be accessed by inspecting the page and clicking on it.

Your SEO strategy will be affected by the introduction of Google's Core Web Vitals.

For websites with bad page experience, Core Web Vitals SEO will have a significant influence. Most websites with an excellent user experience will have little effect. The reason for this is that Google still places greater importance on other factors, such as the quality of the content of a website, in its search rankings.

Prioritize providing high-quality content that is relevant to the searcher's purpose and completely covers the topic in order to improve your SEO. Focus on optimising pages for Core Web Vitals metrics once you've done that.

What are the most important aspects of a website?

CWV are a collection of quantifiable performance indicators established by Google to quantify the quality of user experiences on a website.

When it comes to your website's health, what are the three most important signals?

LCP, FID, and CLS are the three most important web metrics. A web page's loading experience, interactivity, and visual stability are all assessed using these metrics.

In what time period will the new core web vitals be in effect?

By the end of August, Core Web Vitals will have been completely implemented as part of Google's page experience upgrade for all top articles published on or after Thursday, June 17th, 2021.