Optimizing Site For Core Web Vitals

All we knows that Google's Core Web Vitals (Algorithm focusing on Page experience) has been rolled out in June. There are many sites has gets the this update hit in both positive and negative way. This new algorithm update involving website speed and performance since last year. And now it's finally started rolling out.

Recently Barry Schwartz published an article that saying about 

Google Says Now

The Page Experience Update Is More Than A Tie Breaker Ranking Factor

Check full article here

So what this update is all about. Lets learn how we can do or prepare for getting highs from these updates. Google algorithms always come with bringing something happening for website performance. Some websites get high, some get low depending upon the nature of the algorithm. But this upcoming algorithm is mainly focused on the Website Page experience.

Recently Google has added a new tab in Google search console namely “Page Experience”. This tab evaluates the overall page information based on the quality webpage for security, and page performance. 

How will the page Experience update work?

The new page experience signals connect Core Web Vitals with existing search signals such as mobile friendliness, safe surfing, HTTPS security, and intrusive interstitial standards, among others. Let's check each signals in brief to understand how to evaluate data for improving site for Page experience.


Core Web vitals Loading, Interactivity, Visual Stability

Photo credit - Google Search Central - Core Web vitals Loading, Interactivity, Visual Stability

What is the impact of Page Experience Update on your website?

Page experience update its effects on a single page rather than the whole website. So it is more important to focus on improving the page related issues. This update will evaluate each and every page separately for providing the best page experience for users.

Google's major goal is to make the web a great place for people to engage, share, and find reliable sources of information quickly.

What are the Core Web Vitals?

Core web vital is a new measure Google introduced to understand and evaluate the experience users get on a website. By improving Core web vital factors you can make your website more accessible for users and improve your performance for search engine ranking. 


Those web vitals mainly focus on performance, interactivity, and visual stability.

There are Main 3 existing Core Web vitals and Other also considered in this algorithm updates.

Page Experience update is Based on following 3 main factors

Loading Performance - Its is the measure of How quickly the information appears on screen.

Responsiveness - How quickly does it respond to user search.

Visual stability - It measures the stability of content while loading.


To measure the above factors Google has introduced three metrics to evaluate the correct information about each factor to find the main cause and provide the right solution for better Page experience. Those Metrics are as follows

Main Existing Top Core Web Vital Metrics

Largest Contentful Paint (LCP)

First input Delay (FID)

Cumulative Layout Shift (CLS)

Other Metrics

Mobile Friendliness

Safe Browsing 

HTTPS  Enabled

No Intrusive Interstitials

Largest Contentful Paint (LCP) :

It measures the time taken by the largest content in a page to appear on screen. This measure is most important because it's within users' first interaction span. The content would be the text or images. A good score shows that the site is loading fast without any interruption and not causing any cause for user to interact at first glance.

Largest Contentful Paint (LCP)

Largest Contentful Paint (LCP)


With LCP loading performance is measured. LCP should occur within 2.5 seconds of the page initially loading to give a good user experience. 

LCP considered good if it Loads within 2.5sec

Needs Improvement it takes 2.5<=4.0sec

And poor when it takes more than 4.0 sec

 First Input Delay:

Fisrt input dealy or FID the term you can find in Pagespeed insight deals with the time taken by site to interact with the first interaction. This could be on taop of button or any enhancement that appears instantly while page load. The good grade defines and conclude that site is load properly with given input, this fact helps to make the first interaction for the user to get known about the first content on page page.

Delay can be occur while browser having another background task. When user hit search for particular page and it load but when he interacts with any enhancement this could get time to display. This issue can cause delay for page load and this causes the problem for page response. May it cause higher bounce rate and cause drop in ranking. 

Score details
Good FID score - between 0ms to 100ms
Need Improvement - 100ms to 300ms
Poor Performance - more that 300ms 

How to resolve FID issues?

You cant count FIS of there is no user interaction. Hence, google can give measures based on its lab data. To understand this measurement you have some user interaction on page.

But this is the most difficult part. Most websites may benefit greatly by decreasing the time it takes to run JavaScript, splitting up complicated operations, or eliminating unnecessary JavaScript.

First input delay FID



Some useful ways to get rid of FID

  • Break up some long task
Long Tasks are JavaScript execution intervals during which users may find your UI unresponsive. A Long Task is any piece of code that stalls the main thread for 50 milliseconds or longer.

  • Optimize your page for interactivity.

JavaScript size bloat, long execution times, and improper chunking may all slow down how quickly a website responds to user interaction, affecting FID, TBT, and TTI.

Progressive loading of code and features can aid in spreading out this effort and improving interaction readiness.

Cumulative Layout Shifts (CLS)

Third metrics of core web vital that deals with the total stability of web page stuff after the fully loading.

It examines how frequently and by how much things bounces around when loading. You might picture a button appearing on the screen from time to time, asking viewers to click it.

Cumulative layout shifts



To determine the shift of elements, the Cumulative Layout Shift compares frames. It takes all of the places where layout shifts occur and estimates the magnitude of those moves. Anything less than 0.1 is considered OK by Google, but anything between 0.1 and 0.25 requires improvement. Everything above 0.25 is considered poor.

CLS Score
Good -  0 to 0.1s
Need Improvement -0.1s to 0.25s
Poor - Above 0.25 

What caused CLS issue?

  • Images without dimensions
  • Advertisements, embeds, and iframes with no dimensions.
  • Content that is inserted dynamically
TOOLS FOR BETTER MEASUREMENT FINDING THE RIGHT ISSUES
  • Google pagespeed insights
  • GTMetix
  • Webpagetest
  • Pingdom
For more assistant check Web.dev for more guidance and details.



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