Does Core Web Vitals Matter? What Do They Do?

Suppose you’re browsing the web for information about a product or service. You open a webpage, but it takes ages to load. When it ultimately loads, you attempt to click a button, but the website fails to respond immediately.

And just when you thought it couldn’t get any worse, the information on the website begins to shift around unexpectedly, making it difficult to read or click on anything.

That seems like a frustrating experience, doesn’t it?

That is exactly the kind of horrible user experience Google wants to avoid with Core Web Vitals.

Core Web Vitals are three indicators that Google uses to evaluate a website’s loading speed, responsiveness, and visual stability. In other words, they help to decide if a website gives a positive or negative user experience.

So, why do these Core Web Vitals matter?

Google aims to ensure that the websites it suggests in its search results provide an enjoyable experience for users. After all, if a website is slow, unresponsive, and graphically unstable, you’re not likely to stay for long.

That is why websites with higher Core Web Vitals ratings may appear higher in Google search results, providing them an edge in gaining more visitors and prospective customers.

We will discuss about what are core web vitals.

Do core web vitals matter and their impact on user experience and search?

Let’s begin!

What Are Core Web Vitals?

Core Web Vitals is simply a set of Google-created criteria or rules to evaluate how effectively a website performs and offers a positive user experience.

Think of it as a website report card. It analyses factors that are essential for everyone viewing a website.

The three core web vitals are:

  • Largest Contentful Paint: This measures the speed at which the main content on a website’s pages loads. LCP should be less than 2.5 seconds to ensure a positive user experience. Nobody loves gazing at a blank screen, waiting for anything to occur.
  • Cumulative Layout Shift: This analyses how often the layout and information on a page change around unexpectedly while it is still loaded. CLS should be less than 0.1 to offer a good user experience. Content moving about makes it difficult to read, and you may mistakenly click on the incorrect thing.
  • First Input Delay: This metric assesses how quickly the website responds when you click on or interact with something. Delays and latency may be quite worsening. FID should be less than 100 milliseconds for optimal user experience.

Google has revealed that a fourth metric, Interaction to Next Paint (INP), would replace FID as part of Core Web Vitals in March 2024. INP should be 200 milliseconds or fewer to ensure a quick and responsive experience.

So, in simple terms, Core Web Vitals are Google’s way of measuring if a website loads quickly, responds to interactions, and lacks unexpected layout changes.

Why Do Core Web Vitals Matter?

As of June 2021, Google regards Page Experience as an official Google ranking factor. Page Experience is a set of elements that Google considers important for providing an excellent overall consumer experience. These include the following:

  • Using HTTPS to serve your page
  • Mobile-friendliness
  • The absence of distracting interstitials (annoying pop-ups)
  • Safe-browsing
web core vitals

Core Web Vitals are important since they directly connect with a user’s engagement, satisfaction, and website conversion rates. If a site performs poorly on Core Web Vitals, users are likely to have a negative experience.

Here are some important reasons why you should worry about Core Web Vitals:

a. Happy Users

Users are more satisfied when the site runs smoothly. Good Core Web Vitals indicators lead to happy users.

b. Lower Bounce Rate

Pages with a quick LCP and low CLS keep users on the page for longer periods before they bounce.

c. Higher Conversions

A responsive site with strong FID increases users’ chance to complete a transaction or join up for a service.

d. Improved SEO

Pages that provide users with an enjoyable experience tend to rank higher in search results. Core Web Vitals are a ranking metric.

e. Increased Revenue

A direct link exists between enhanced Core Web Vitals and increased revenue, driven by stronger engagement and conversion rates. Google also includes Core Web Vitals in its ranking factors.

As a result, optimizing these metrics can help your website rank higher in search results and generate more visitors to your website.

What are Recommended Criteria For Core Web Vitals Metrics?

a. Largest Contentful Paint

Largest Contentful Paint (LCP) is one of three key web vitals metrics that evaluate a website’s user experience. LCP particularly measures how soon the primary content of a webpage loads and becomes accessible to the user.

Simply, LCP evaluates how long it takes for the largest, most essential visual element on the website to load and show. This might be a large picture, video player, text block, or any other important piece of information that viewers expect to see first when they visit that page.

A good LCP time is 2.5 seconds or less. This means that when a user visits the website, the main picture, video, or important block of text loads almost instantly. An LCP of 2.6 to 4 seconds indicates that your site’s speed has to be improved.

Anything longer than 4 seconds is considered bad LCP. Because it can annoy visitors and bring them to quit your site.


From a technological standpoint, optimizing LCP may include tactics like:

  • Optimizing and reducing big media files
  • Prioritizing key resource loading
  • Using techniques for performance like code splitting
  • Effective use of browser caching

b. Cumulative Layout Shift

Cumulative Layout Shift (CLS) is another Core Web Vitals metric introduced by Google. It assesses the visual stability of a website.

Cumulative Layout Shift (CLS) is a consistent Core Web Vital metric. It is an essential, user-centered metric for analyzing visual stability since it measures how frequently users experience unexpected layout changes. A low CLS helps to guarantee that the page is pleasant.

Unexpected layout changes may interrupt the user experience in a variety of ways, including causing them to lose their position while reading if the text jumps unexpectedly or clicking the wrong link or button. In certain circumstances, this can cause considerable harm.

A great CLS score of 0.1 or less indicates that your website layout is quite stable. This allows people to easily see your content without interruption.

A CLS score of 0.1 to 0.25 indicates that your website’s visual stability need improvement. There is enough moving to be apparent to users.

A bad CLS score of more than 0.25 indicates that your page elements move around a much. Users may notice major shifts such as text or buttons moving suddenly. This is harmful to their experience. 


c. First Input Delay

First Input Delay (FID) is the third metric in Google’s Core Web Vitals. It assesses a website’s responsiveness to user interactions. FID measures how quickly a website responds when a user first interacts with it.

Examples of interaction include:

  • Selecting a menu item in a dropdown
  • Clicking a link from your site’s navigation
  • Entering their email address into a form field
  • Open the “accordion menu” on a mobile device

Google values FID because it reflects how easily real-world customers can interact with your website. FID should be less than 100 milliseconds for the best user experience. 

d. Interaction to Next Paint

Interaction to Next Paint (INP) is the most recent Core Web Vitals measure, succeeding First Input Delay (FID) on March 12, 2024. It represents how quickly a page reacts to interactions and is measured in milliseconds.

It is worth noting that INP measures how quickly a webpage reacts during the user’s interaction with it. FID only tracked the response time of the first user contact with any element on the site. 

A good INP is 200 milliseconds or less. An INP between 200 and 500 milliseconds indicates that your site’s interaction needs enhancing.

An INP of more than 500 milliseconds represents a horrible interactive experience for your users. This involves obvious lags and delays in responding to user inputs.


How to Check Your Site’s Core Web Vitals Performance?

CWVs can be checked using a variety of tools. All of the offerings directly from Google are listed below:

Chrome UX Report (CrUX) provides field data supplied by Chrome users, allowing site administrators to learn about how real people interact with their websites.

    Google Lighthouse is a free application that generates lab measurements for CWVs. It provides useful data on performance, SEO, and accessibility, among other things.

    Google PageSpeed Insights combines the features of CrUX and Lighthouse, providing field and lab data on CWVs and other web metrics. PageSpeed Insights allows users to assess the performance of websites, whether or not they own them. This is an example of a PageSpeed Insights report.

    Google Search Console is based on CrUX field data and provides CWV performance statistics by URL or set of URLs.

    Let’s check core web vitals using one of the tools:

    a. Google PageSpeed Insights

    Google PageSpeed Insights (PSI) is a free tool for assessing the performance of a single webpage on mobile and desktop devices.

    It also offers ways to make your page quicker and simpler to use. To measure a page’s Core Web Vitals performance, open PageSpeed Insights, input the URL you wish to examine and click “Analyse.”

    page speed insights

    When your report is done, you will receive a full breakdown of your performance across many parameters.

    The “Performance” score runs from 0 to 100 and is based on the following metrics:

    • First Contentful Paint 
    • Speed Index
    • Largest Contentful Paint
    • Total Blocking Time
    • Cumulative Layout Shift

    Your Core Web Vitals findings look like this:

    core web vitals

    Scroll down to the “Diagnostics” section for a list of things you can do to boost your site’s performance. 

    Keep in mind that the Core Web Vitals report isn’t intended to help you determine the status of a particular page. Instead, it allows you to determine the overall health of your website.

    How to Improve Core Web Vitals Performance?

    a. Improving LCP

    Use a content delivery network (CDN): CDNs cache material in several places across the world, allowing content to reach consumers more rapidly.

    Optimize images: Images tend to be the largest element on a page. Reducing the size of an image file can assist speed up its loading time.

    Another option to boost your LCP score is to boost your site hosting.

    Shared hosting (where numerous sites are hosted on the same server) may be slower since everyone shares resources such as memory and processing power. As a result, when other sites have traffic surges, your site may slow down. 

    To solve this, look into switching to a better hosting plan or an alternative form of hosting. For example, dedicated hosting (where your site has its server) or cloud hosting (when numerous servers are used to give more consistent performance).

    b. Improving CLS

    1. Minimize third-party page elements: Third-party elements on a page load from different places than the rest of the page. As a result, they may load at slightly different times, causing the page’s layout to change. Using fewer third-party items reduces the amount of layout changes.

    2. Reserve space for embedded content: Many third-party features, such as advertisements, are necessary for a website’s operation or economic strategy and cannot be removed. Developers can set aside space on the page for these components to load before the browser retrieves the real element.

    3. Ensure that photos load at their optimal size: This is a slightly different approach than optimizing images in general. Desktop PCs, tablets, and smartphones all require graphics in somewhat varying sizes due to screen size differences. If a browser loads the huge, desktop-optimized picture first and then needs to download the mobile-optimized image because the device in use is a smartphone, the content on the page may move around when the different-sized image loads.

    4. Include the height and width of photos and videos: The height and width parameters indicate how large an image will be, allowing browsers to reserve that space before the picture or video loads. Our HTML5 video page contains further information on how to achieve this with video.

    5. Use CSS aspect ratio boxes:  CSS developers may use a variety of strategies to save space for a page element by leveraging aspect ratios. 

    c. Improving INP

    One of the most important issues that can degrade your Interaction with Next Paint is the presence of several huge scripts or JavaScript code on your site.

    JavaScript is a computer language that creates dynamic website elements such as menus, forms, and animations. However, heavy or complicated JavaScript code might slow down how quickly your website responds to user interactions.


    • Reduce the amount of JavaScript functions: Code-heavy dynamic webpages might create input delays since the browser needs to load all of the code before executing it. JavaScript minification can help speed up this process.
    • Create static HTML webpages: Static HTML pages load far quicker than dynamic ones, particularly when delivered via CDN. Learn about static site generators or Jamstack, a development strategy that focuses on static content.
    • Remove any unwanted third-party tools and scripts: Loading extra tools on your website can harm speed. Reduce the number of third-party tools on a website to increase FID and overall website performance.


    So, Do core web vitals matter? 

    Core Web Vitals absolutely matter when it comes to creating a first-class, hassle-free experience for everybody visiting your website 

    While optimizing for these vitals requires some dedicated skills from your web developers, the reward is huge: creating excellent digital experiences that keep customers satisfied and returning for more help. Mastering those Core Web Vitals in 2024 and beyond will be critical to online success.

    Read more on Link Velocity .


    1. What precisely are the Core Web Vitals?

     Core Web Vitals are three essential measures developed by Google to assess the real-world experience of accessing a website. They are Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS).

    2. How can I measure Core Web Vitals for my website?

    Google provides a variety of tools for measuring Core Web Vitals, including Google PageSpeed Insights, Google Search Console, and Lighthouse. These tools give extensive information about your website’s performance and recommend changes.

    3. Do Core Web Vitals affect SEO?

    Yes, Core Web Vitals are now considered part of Google’s ranking algorithm. Websites that deliver a better user experience, as demonstrated by high Core Web Vitals ratings, are more likely to appear higher in search results.

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