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What are the 4 Core Web Vitals?

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What Are Web Vitals?

Web vitals are a set of metrics that measure the health and performance of a website. They offer crucial insights into how your site performs from a user experience perspective. But what really makes a site tick in terms of speed, usability, and stability? Enter Core Web Vitals.

Importance of Core Web Vitals

Wondering why Core Web Vitals are the talk of the SEO town? Well, they directly influence how Google ranks your site. That's right, improve these, and you could climb those coveted search rankings.

Largest Contentful Paint (LCP)


LCP measures the time it takes for the largest content element on your webpage to fully load. Simply put, it gauges how long users wait to see the main content.

Why It Matters

First impressions are everything. If your site takes forever to load, users might bounce, potentially costing you valuable traffic and conversions.

How to Measure and Improve LCP

Tools like Google PageSpeed Insights can help you analyze LCP. Reducing CSS and Javascript, using lazy loading for images, and optimizing server speed can significantly improve LCP.

First Input Delay (FID)


FID gauges the time from when a user first interacts with your site (e.g., clicking a link) to when the browser actually responds to that interaction.

Why It Matters

It's all about engagement. A site that reacts instantly to user interaction scores high on usability.

How to Measure and Improve FID

Again, Google PageSpeed Insights can help. Minimizing JavaScript, using browser caching, and reducing server response times can better FID.

Cumulative Layout Shift (CLS)


CLS measures the visual stability of your site. Ever had elements shifting around while a page is loading? That's what CLS monitors.

Why It Matters

Unstable layouts can cause users to click the wrong buttons or links, leading to a poor user experience.

How to Measure and Improve CLS

To get the CLS score, you can use tools like Google's Lighthouse. To improve it, make sure to specify dimensions for any media, and avoid inserting content above existing content.

Time to First Byte (TTFB)


TTFB measures the duration from the user's browser requesting a page to the first byte of the page being received.

Why It Matters

Quick server responses are vital for keeping the user engaged. High TTFB values can negatively impact all other Core Web Vitals.

How to Measure and Improve TTFB

Utilize server monitoring tools and consider implementing CDN services to lower TTFB.

How Core Web Vitals Affect SEO

In the realm of digital marketing and website management, Search Engine Optimization (SEO) is often considered the cornerstone for driving organic traffic. However, with Google's increasing focus on user experience, Core Web Vitals have become an essential part of this puzzle. Let's break down how these metrics influence SEO.

Direct Impact on Google's Ranking Algorithm

Starting from June 2021, Google began incorporating Core Web Vitals into its ranking algorithm. Sites that fail to meet the standards for LCP, FID, and CLS are likely to experience a drop in their search rankings.

How to Adapt: Regularly audit your website using tools like Google PageSpeed Insights and Lighthouse to ensure you meet the specified criteria.

Enhanced User Engagement

Good Core Web Vitals scores usually correlate with better user experience, leading to lower bounce rates and higher time-on-page metrics. Both are factors that Google considers while ranking websites.

How to Adapt: Prioritize user experience in every aspect of your website design and functionality. Happy users are more likely to engage with your content, sending positive signals to Google's algorithm.

This is one of our favorite resources on On-Page SEO.

Increased Conversion Rates

If a user enjoys smooth interactivity and quick load times on your website, they are more likely to convert—be it making a purchase, subscribing to a newsletter, or sharing your content. Google takes note of these user behaviors as indications of a quality website.

How to Adapt: Keep an eye on your conversion funnel and identify any bottlenecks that could be improved by optimizing Core Web Vitals.

Improved Crawl Efficiency

A faster, more efficient website can be crawled more quickly by search engine spiders, making it easier for Google to index your pages. This leads to more accurate and timely inclusion in search engine results.

How to Adapt: Make sure your website is easily navigable with a well-structured sitemap and that it meets Core Web Vitals standards for speed and responsiveness.

Competitive Advantage

In industries where the competition for the top spot in Google search is fierce, having better Core Web Vitals can give you the edge you need to surpass your competitors.

How to Adapt: Always be aware of how your website stacks up against competitors in terms of Core Web Vitals and make the necessary adjustments to stay ahead.

Tools to Measure Core Web Vitals

Google PageSpeed Insights

Google PageSpeed Insights is a powerful tool that should be in every webmaster's arsenal. Designed to evaluate both the mobile and desktop versions of a site, this tool provides a comprehensive analysis of your site's performance, particularly focusing on Core Web Vitals like LCP, FID, and CLS. After running a quick scan, PageSpeed Insights generates a detailed report that not only gives you scores for these vitals but also offers actionable recommendations to improve them. What sets this tool apart is its user-friendliness; you don't need to be a tech wizard to understand its reports. The results are broken down into different sections, such as opportunities for improvement and diagnostics, making it easier for you to pinpoint exactly what needs attention. Additionally, it offers a "real-world" field data section, giving you an understanding of how actual users are experiencing your site. This data-driven approach provides webmasters with the insights they need to make targeted improvements, enhancing both user experience and search engine rankings.


Lighthouse is another invaluable tool from Google's suite that goes beyond just measuring Core Web Vitals to offer a full picture of your website's health. The tool is built right into the Chrome browser, making it incredibly accessible for developers and website owners alike. Lighthouse examines a range of performance metrics, SEO practices, accessibility standards, and more, along with your Core Web Vitals like LCP, FID, and CLS. It's a one-stop-shop for anyone interested in rigorous, comprehensive site analysis. After the test run, Lighthouse generates an easy-to-read report card, assigning scores in different categories and offering actionable recommendations for improvement. What makes Lighthouse unique is its ability to run both simulated and real-user analyses, thereby giving you an incredibly detailed understanding of how your website performs under various conditions. Whether you're a seasoned developer looking to fine-tune your site or a small business owner wanting to understand how your website stacks up against best practices, Lighthouse provides the insights you need to elevate your website's user experience and performance.

Other Tools

Various other tools like GTmetrix and WebPageTest also offer insights into your web vitals.

Common Mistakes & How to Avoid Them

Navigating the world of Core Web Vitals can be complex, and it's easy to fall into some common pitfalls. Here are some typical mistakes and how you can sidestep them.

Ignoring Metrics Altogether

Some website owners may feel that their content is strong enough to ignore Core Web Vitals. This is a perilous approach. As Google continues to place more importance on these metrics, ignoring them could result in a significant drop in search rankings.

How to Avoid: Keep a close eye on your Core Web Vitals by regularly checking tools like Google PageSpeed Insights and Lighthouse. Make it a routine part of your website maintenance.

Focusing Only on Desktop or Mobile

In the age of multi-device internet usage, focusing solely on either mobile or desktop can be a grave mistake. Many people neglect mobile performance, but Google's ranking algorithm gives considerable weight to mobile-friendliness.

How to Avoid: Always test your site's performance on both desktop and mobile. Make sure that it's optimized for various devices and screen sizes.

Not Updating Your Website

The web is an ever-changing landscape. What was considered fast or user-friendly a year ago may no longer hold true today.

How to Avoid: Consistently update your website by incorporating the latest SEO practices and technologies. Keep an eye on emerging trends and be prepared to adapt.

Overloading the Website

While interactive features and high-resolution images make your site look appealing, they can severely impact your Core Web Vitals if not properly optimized.

How to Avoid: Use lazy loading for images and videos, minimize the use of heavy JavaScript libraries, and optimize your CSS and HTML.

Ignoring User Experience

Some people get so caught up in metrics that they forget the end goal: providing a good user experience.

How to Avoid: Always place yourself in the shoes of the user. Metrics are important, but they're means to an end. Use them to create a more responsive, engaging, and enjoyable website for your visitors.

The Future of Core Web Vitals

The digital landscape is an ever-evolving entity, and just as technology continues to innovate, so does the importance and complexity of user experience. As we delve into the foreseeable future of Core Web Vitals, several key developments are on the horizon.

Growing Emphasis on UX Metrics

Google has always been about providing the best user experience. With the introduction of Core Web Vitals, it's clear that the tech giant is further refining its approach. In the coming years, we can expect more nuanced metrics to emerge, giving webmasters a deeper insight into user behavior and preferences.

Integration with Machine Learning and AI

Machine learning and artificial intelligence (AI) are becoming deeply embedded in various online platforms. In the future, these technologies could play a role in analyzing and predicting Core Web Vitals, offering automated solutions for improvement, and providing a more personalized user experience.

Greater Interplay with Content and Design

As Core Web Vitals further emphasize the importance of a seamless user experience, the integration of content and design will become paramount. Web designers and content creators will need to work hand-in-hand to ensure that not only does a site perform well, but it also provides valuable, easily digestible content in an aesthetically pleasing manner.

Holistic Approach to Site Health

While the current Core Web Vitals focus on specific areas like loading performance, interactivity, and visual stability, the future might see a more holistic approach. This could include metrics related to accessibility, security, mobile responsiveness, and more. In essence, every facet of a website might soon play a part in its overall "vital" health.

Actionable Steps

  1. Measure your Core Web Vitals
  2. Analyze the data
  3. Make the necessary improvements
  4. Repeat


Understanding and optimizing Core Web Vitals is no longer a luxury—it's a necessity. By giving attention to these vital metrics, you're not just improving your SEO; you're enhancing the overall user experience. Now, isn't that something worth investing in?

Higglo Digital is a full-service SEO and web agency. From Hulu to Blizzard, we’ve worked with clients across many industries and markets including Dubai, Riyadh, New York City and Sydney. We have the expertise and experience to take your brand to the next level. We create memorable brand experiences and award winning websites.

Frequently Asked Questions

What are Core Web Vitals?

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They are a set of metrics that measure the performance and user experience of a website.

How do Core Web Vitals impact SEO?

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Google uses them as ranking factors, so they directly affect your site's visibility.

How can I measure my site's Core Web Vitals?

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Tools like Google PageSpeed Insights and Lighthouse can provide this data.

Are Core Web Vitals the only factors affecting website performance?

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No, but they are among the most critical ones to monitor.

Can I ignore Core Web Vitals if my site is already doing well?

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Doing so would be risky, as Google continues to give these metrics more weight in its ranking algorithms.

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