User Experience Signals
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Core Web Vitals

In today's world, delivering an exceptional user experience is paramount for website success.

With the rise of mobile browsing and the increasing emphasis on page performance, Google has introduced Core Web Vitals as essential metrics for evaluating website performance and user satisfaction.

Core Web Vitals provide crucial insights into how users perceive and interact with your website.

Optimizing your website with Core Web Vitals not only enhances user experience but also improves search engine rankings.

In this article, we will delve into the significance of Core Web Vitals, explore each metric in detail, and discuss actionable strategies to improve your website's performance.

By implementing these optimization techniques, you can create a faster, more responsive, and user-friendly website that leaves a lasting positive impression on your visitors.

Here is what you will read in this article:

  • What Are Core Web Vitals?
  • Why Are Core Web Vitals Important?
  • Largest Contentful Paint (LCP)
    • Remove any unnecessarily third-party scripts
    • Upgrade your web host
    • Set up lazy loading
    • Remove large page elements
    • Minify your CSS
  • First Input Delay (FID)
    • Minimize (or defer) JavaScript
    • Remove any non-critical third-party scripts
    • Use a browser cache
  • Cumulative Layout Shift (CLS)
    • Use set size attribute dimensions for any media (video, images, GIFs, infographics etc.)
    • Make sure ads elements have a reserved space
    • Add new UI elements below the fold
  • Conclusion

What Are Core Web Vitals?

Core Web Vitals are a set of specific factors that Google considers important in a webpage’s overall user experience.

They provide insights into a URL’s performance and are grouped into three key metrics:

1. Largest Contentful Paint (LCP)

2. First Input Delay (FID)

3. Cumulative Layout Shift (CLS)

These metrics focus on page speed and user interaction, providing valuable information on how well your website performs and how users engage with it.

Why Are Core Web Vitals Important?

Google plans to make page experience an official ranking factor, and Core Web Vitals play a crucial role in determining the overall user experience.

While page experience is just one of many factors Google considers, it's becoming increasingly significant.

By optimizing your website based on Core Web Vitals, you can enhance user satisfaction, improve search engine rankings, and ultimately drive more organic traffic to your site.

Largest Contentful Paint (LCP)

LCP measures how long it takes for the largest content element on your page to load.

It represents the point at which users can see the majority of the content on their screens.

To improve your LCP score, consider implementing the following strategies:

Remove any unnecessary third-party scripts

Third-party scripts can significantly slow down your page's loading speed.

Identify and remove any scripts that are not essential for your website's functionality.

Each unnecessary script eliminated can contribute to faster LCP times.

Upgrade your web host

Choosing a reliable and high-performance web host is crucial for improving your website's overall speed and LCP.

Invest in a hosting provider that offers fast server response times, efficient resource allocation, and optimal website performance.

Set up lazy loading

Lazy loading is a technique that delays the loading of non-visible images, videos, and other media elements until the user scrolls to them.

By implementing lazy loading, you can prioritize the loading of content that users immediately see, improving LCP and providing a smoother user experience.

Remove large page elements

Identify any large elements on your page, such as oversized images or videos, that contribute to slower loading times.

Optimize these elements by compressing images, using appropriate video formats, or removing unnecessary content to improve your LCP score.

Minify your CSS

Bulky CSS files can slow down your page's rendering and impact LCP.

Minify your CSS by removing unnecessary spaces, comments, and redundant code.

Additionally, consider combining multiple CSS files into a single file and leverage browser caching to enhance performance.

First Input Delay (FID)

FID measures the time it takes for a user to interact with your page after it has loaded.

To reduce FID and provide a more responsive user experience, implement the following strategies:

Minimize (or defer) JavaScript

JavaScript execution can block user interactions on a page.

Minimize or defer non-critical JavaScript code to ensure that users can interact with your website while the browser continues loading scripts in the background.

This optimization can significantly improve FID.

Remove any non-critical third-party scripts

Similar to LCP optimization, eliminating non-essential third-party scripts can also improve FID.

Evaluate the impact of each third-party script on user interactivity and remove those that are not crucial to your website's functionality.

Prioritize critical scripts and find alternative lightweight solutions when possible.

Use a browser cache

Enabling browser caching allows your website's content to be stored locally on a user's device.

By leveraging browser caching, subsequent page visits will load faster as the browser retrieves cached resources instead of fetching them from the server.

This optimization technique can greatly reduce FID and enhance the overall user experience.

Cumulative Layout Shift (CLS)

CLS measures the visual stability of a webpage during its loading process.

It quantifies how much page elements shift or move unexpectedly, potentially causing user frustration.

To minimize CLS and provide a more stable browsing experience, consider the following strategies:

Use set size attribute dimensions for any media

By specifying the dimensions (width and height) of images, videos, GIFs, and other media elements, you ensure that the browser allocates the appropriate space for them.

This prevents sudden layout shifts as the page fully loads and maintains visual stability throughout the user's browsing experience.

Make sure ads elements have a reserved space

If your website displays advertisements, ensure that ad elements have a designated space reserved for them.

By reserving space, you prevent unexpected layout shifts when ads load and appear on the page.

This optimization contributes to a smoother user experience and reduces the likelihood of accidental clicks.

Add new UI elements below the fold

To prevent content from pushing down existing elements and causing layout shifts, consider placing new user interface (UI) elements below the fold.

By keeping new content out of the initial viewport, you maintain visual stability for users, as they won't experience sudden changes to the layout as they begin interacting with the page.


Incorporating these optimization techniques based on Core Web Vitals can significantly improve your website's performance, user experience, and search engine visibility.

Regularly monitor your website's metrics using tools like Google PageSpeed Insights and Google Search Console to track your progress and identify areas for improvement.

By prioritizing the optimization of LCP, FID, and CLS, you can provide a seamless browsing experience that keeps users engaged and satisfied.

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