Are You Ready for Google Core Web Vitals in 2021?

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Loading Speed of a website is very important, every website owner or marketer can update you with this. We find various reasons behind the loading speed, like customers, stay longer on your website, the rate of conversion is high, etc. The ranking of your website might be based on this feature. Core Web Vitals is also becoming one of the ranking factors in 2021.

Google has already announced that the Core Web Vitals would become a ranking factor in May 2021. There are other page experiences and user signals which can be combined with this, and looked upon as a ranking signal like mobile-friendliness and intrusive interstitials.

The metrics revolve around the completion of events, which includes interactive or visually affected events that take place. These events are affected while pages load until a point of stability relates to the user experience.

What Are Core Web Vitals?

The Core Web Vitals are generally based on three important metrics that measure loading, visual stability, and interactivity. They are generally linked with the user experience. Here are some details on what these metrics mean on your website, and how do they affect their scores.

Core Web Vitals Metrics screenshot


LCP is the amount of time, which is required to render the largest content element which is visible in the viewport from the time the user requests a URL. The largest content element is present in either the largest image, video, or text block which is within the viewport, but not in the entire page. The average time for an ideal LCP measurement is usually 2.5 seconds or faster than that but not above 4 seconds.

The high LCP scores can be affected by:

  • Large images
  • Large, late loading content
  • Slow server response time
  • Render blocking CSS or JS.

Basically, it is the time a page’s main content takes to get loaded. The average measurement of an ideal LCP is 2.5 seconds or faster than that.


This aspect helps in measuring the responsiveness of your website when the users try to interact at first and not at the start of the load. The goal which is set for the measurement is less than 100 milliseconds ideally and at least under 300 milliseconds. FID is not calculated using a single tool, it is based on Chrome aggregated user experience.

FID is usually affected by these:

  • The browser is parsing and executing a large JavaScript file that is loaded by your app.
  • The third-party ads
  • Social Widgets

Basically, the time is taken for a page to become interactive. The ideal measurement is less than 100 msec.


This aspect helps in finding the amount that the page layout shifts during the loading phase. We usually find this example on the websites, when we are trying to click on some link but it moves and the users click on something which they dint want to. This is usually measured as period time and not as a number. The ideal measurement ranges between 0.1 to 0.25.

CLS is typically caused due to the following:

  • The images which are without dimensions
  • All the Embeds, Ads, or iframes are without dimensions.
  • All the web fonts cause FOIT/FOUT.
  • The dynamically injected content.
  • The actions are waiting on a network response before it is updating DOM.

When the website’s Core Web Vitals are being reviewed, the difference between field data and lab data should be known.

Field data:
The data which is collected in the field or the real world is called field data. The metrics are collected from the user experiences and how do they navigate into your pages.

Lab data:
The data is collected from all the tools which are simulating user interactivity. This is the reason you will see various scores in the Google Search Console (field data) as compared to the third-party tools.

5 Simple Ways to Increase Your Website Loading Speed

Let’s Get to Know About the Metrics

Google is breaking the Core Web Vitals into further three measurements; they are graded after this in three status level:

  • GOOD
  • POOR
LCP<2.5 s<=4s>4s

This table will help you determine which of the three web vitals are good to go or needs improvement.

The Page Audit Tools That Help Measure Web Vitals

The working of the Core Web Vitals is good to know but improving them is equally important. There are various tools that are used by the technical and analytical team during the Page performance which helps in the overall performance:

  • PageSpeed Insights
    The first step of checking the website’s Core Web Vitals is by making PageSpeed Insights. The main attributes which are helpful are lab data and field data. The reports help in improving the failing of the pages.
  • Web Vitals Chrome Extensions
    This is the extension that helps in viewing Web Vitals on the page load and interact with the page which helps in troubleshooting any delay in the First Input or Shifting problems in the content layout.
  • WebPageTest
    This helps in providing the in-depth details of the reason behind the slowing down of your page loads, this also provides insight on the elements which are contributing to the layout shift and the poor CLS scores.
  • Google Search Console
    These are very helpful in terms of the field data metrics; the search console allows to drill down to all the URL groups with the user experiences. The recommendations are provided by Google, on fixing the issues by providing the links to the PageSpeed Insights test on an affected URL.

Grab the Opportunity

These issues need to be addressed as soon as possible, Google has given SEOs and business owners advanced warnings as it is considered to be a big topic for them. It is suggested to use Core Web Vitals and the tools to improve the user experience of your website before they are considered as a ranking factor in 2021. A team is required to work on the metrics as well as the framework of the website.

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Vishakha Puniyani
Articles: 46

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