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What are Core Web Vitals and Why You Should Care?


When it comes to optimizing your website, you do so for various reasons. It’s important that your site is set up to generate leads, optimized for SEO, encourages more email subscribers so you can grow your email list, and that it provides an optimal user experience. 

You may not have heard of it before, but Core Web Vitals are especially important for increasing the experience of your users. Let’s dive into what Core Web Vitals are and what you can do to make sure your website has good Core Web Vitals. 

What are Core Web Vitals

Web Vitals is an initiative by Google on how to provide a great user experience (UX) for the web. Core Web Vitals, a subset of Web Vitals, helps you to judge your website’s UX against a distinct set of UX metrics. 

Google intends to evolve Core Web Vitals over time. However, as of 2021, the current set of Core Web Vitals focuses on the following three areas of UX: loading, interactivity, and visual stability. 

These three areas are measured as Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS).

google core

Why Core Web Vitals Are Important

In May 2020, Google announced that Core Web Vitals would be incorporated into Google’s Search Ranking Signals. What that means is your website’s Core Web Vitals will influence how well your website ranks in Google Search, along with many other ranking factors. 

Google began introducing Core Web Vitals to Google Search in June 2021 and is scheduled to be completed by the end of August 2021. 

Since 2015, Google has been increasing the importance of good website UX as a Search Ranking Signal. This puts more emphasis on website owners to ensure their website UX is excellent if they want to be rewarded with good Google search rankings. 

How Can I Tell if My Website Has Good Web Vitals

Unlike most of the other Search Ranking Signals, Google has made it easy to know if your website has good or bad Core Web Vitals. 

To get a quick overview of your website’s Core Web Vitals, you can use either Google PageSpeed or Google Lighthouse.

For a fast and simplified overview of your website’s Core Web Vitals, enter your website URL into Google PageSpeed and hit the Analyze button. 

google core

To check your website’s Core Web Vitals as well as other user-experience metrics, you can run a Google Lighthouse audit from within Chrome DevTools. 

Although there are other ways to check your website’s Core Web Vitals, these two tools use field data wherever possible as opposed to lab data. Field data means data collected from real-life users that have visited your website in the past. Lab data means simulated data based on averages collected from other websites. 

Google recommends using field data over lab data when testing a live website’s vitals as field data is more closer to what an actual website user would experience in the real world. 

What Can I Do to Make Sure my Website has Good Web Vitals?

Ensuring your website is golden when it comes to Good Web Vitals isn’t necessarily a quick SEO tactic you can implement in just 15 minutes. However, that doesn’t mean it isn’t worth doing. 

Fortunately, Google has outlined what metrics you should aim for if you want to have good Core Web Vitals. They are as follows: 

  • Largest Contentful Paint: within 2.5 seconds of when the page first starts loading.
  • First Input Delay: 100 milliseconds or less.
  • Cumulative Layout Shift: 0.1. or less.

If your website’s Core Web Vitals are not within the thresholds outlined above, the next section will tell you how you can improve them. 

google core

Improving Largest Contentful Paint (LCP)

The time it takes for a browser to receive content from your server can have an adverse effect on how quickly your website appears on the screen. A faster server response time improves page-load metrics, including LCP and time to first byte (TTFB). You can improve your TTFB by:

  • Cleaning up your server and ensuring it has enough resources
  • Implementing a content delivery network (CDN)
  • Ensuring all static website files such as CSS and JavaScript are cached 
  • Making sure HTML pages are served cache-first
  • Establishing third-party connections early
  • Using signed exchanges (SXGs) wherever possible

Unoptimized WordPress websites are notorious for having poor LCP/TTFB metrics. That’s why investing in a high-performance WordPress hosting server is important if you want to achieve the best Core Web Vitals scores.  

Another area that can drastically improve your LCP is optimizing the way your website loads static JavaScript and CSS files. Here are a few ways you can optimize your website CSS and JS file handling:

  • Reduce/remove render-blocking JS and CSS
  • Compress and minify JS and CSS
  • Defer non-critical JS and CSS while making critical JS and CSS inline

Aside from CSS and JavaScript, your website assets (images, videos, and fonts, etc.) could be hurting your LCP. Here are a few ways to minimize the impact your website assets has on your LCP:

  • Remove unnecessary images
  • Optimize and compress all images
  • Use modern image formats such as JPEG 2000, JPEG XR, or WebP
  • Lazy-load website assets and consider using an image CDN
  • Preload any custom web fonts and use the WOFF2 format 
  • Ensure GZIP is enabled on your web server or CDN

google core

Improving First Input Delay (FID)

FID measures the time from when a user first interacts with your web page to the point where they can actually respond. A real-life human interaction would be necessary in order to measure this response delay. That means lab tests will not work to simulate FID. If you are unable to test your website with field data, total blocking time (TFT) can be used as a fallback metric. Here are a few ways to improve your website FID and TFT metrics: 

  • Remove or reduce unnecessary JavaScript 
  • Break up long tasks into smaller asynchronous tasks 
  • Optimize your web page for interaction readiness 
  • Reduce reliance on cascading fetches and third-party JavaScripts
  • Consider on-demand loading for critical third-party JavaScript
  • Use a web worker for non-UI operations 
  • Reduce JavaScript execution time by deferring unused JS 
  • Minimize unused polyfills 

gazduire web

Improving Cumulative Layout Shift (CLS)

Have you ever gone to click a website button only for it to shift its position when the page finally loads? That’s an example of a website with poor CLS. The CLS metric measures how unstable your website layout is by summing up layout shifts that happen without user input. It also looks at how much visible content has shifted in view as well as the distance it shifted by. If your website has poor CLS, here are a few ways to improve it: 

  • Always include width and height size attributes on your website images and videos
  • If your website has banner ads, statically reserve a space for the ad slots
  • Avoid placing non-sticky ads at the top of the viewport
  • Use a placeholder or fallback to reserve the space for iframes and embeds 
  • Avoid pop-ups that shift the layout of your web pages when they are still loading
  • Avoid using animations that shift your website layout 
  • Use the CSS transform attribute over attributes that can cause layout shifts such as box-shadow and box-sizing 

Wrapping Up

Website optimization is crucial for success. Your site plays a key role in growing your email list and getting you new leads to engage with. It needs to be built successfully so it leaves an impression and delights your users.

Improving your Core Web Vitals will not only help improve your user experience but also your website’s ability to rank well in Google search.

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