Core Web Vitals: Enhancing User Experience and Boosting Website Performance

Safalta Expert Published by: Abhishek Mishra Updated Mon, 17 Jul 2023 03:47 PM IST

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Staying ahead of the curve in the dynamic realm of Search Engine Optimisation (SEO) is paramount for the success of your website. In the past years, an area of prime significance has emerged, known as the integration of Core Web Vitals. These Vitals encompass a collection of user-centric metrics meticulously gauging a website's performance, responsiveness, and holistic user experience. Their purpose is to provide website owners and SEO experts with a uniform approach to evaluating and enhancing the efficiency of their web pages.

Google created the concept of Core Web Vitals as part of their ongoing endeavour to prioritise user experience in search rankings. Google intends to award websites based on these precise metrics.

Table of Content
Understanding Core Web Vitals
The Benefits of Optimising Core Web Vitals
Strategies for Optimising Core Web Vitals

"A web page must meet the 75th percentile for all three metrics to pass the Core Web Vitals assessment.


It takes at least 28 days for changes to be picked up by Google's testing tools. Only 12% of mobile and 13% of desktop sites are optimized for the assessment. 84% of US mobile SERPs URLs need improvement or poor scores. Position 1 has a 10% higher pass rate than position 9, while position 5 experiences a 2% decrease in pass rate. (Source-Huckaby)"

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Understanding Core Web Vitals

Core Web Vitals are a set of specific metrics that measure various aspects of the user experience, focusing on three main areas: loading, interactivity, and visual stability. These metrics provide developers and website owners with actionable insights into how their websites perform and enable them to make targeted improvements. The three core metrics are as follows:
  • Largest Contentful Paint (LCP): This metric counts the time it takes for the visitor to see the largest piece of content on a webpage. A fast LCP guarantees that consumers can immediately access the primary content of a page, lowering the perceived loading time.
"Largest Contentful Paint accounts for 25% of Google Lighthouse Performance Score. Aim for a score under 2.5 seconds. 43% of mobile and 44% of desktop URLs pass the benchmark. B2B and retail websites have mobile scores above 2.5s.(Source-Huckaby)"
  • First Input Delay (FID): One of the Core Web Vitals indicators is the First Input Delay (FID). It computes the time taken between the first user interaction with your website and the point at which the browser can begin processing that interaction. A low FID indicates a highly responsive website that delivers a smooth user experience.
"25% of Google Lighthouse Performance Score is First Input Delay; aim for 100 milliseconds; 89% of mobile and 99% of desktop URLs meet benchmark.(Source-Huckaby)"
Also Read: Shopify Marketing: Unlock Success for Your E-commerce Store
  • Cumulative Layout Shift (CLS): CLS quantifies the visual stability of a webpage by measuring the number of unexpected layout shifts that occur during the page's loading process. A low CLS ensures that elements on the page do not move unexpectedly, preventing frustrating experiences for users.
"Aim for a Cumulative Layout Shift under.1 for Google Lighthouse Performance Score, with 46% of mobile and 47% of desktop URLs passing.(Source-Huckaby)"

The Benefits of Optimising Core Web Vitals

  • Enhanced User Experience: By optimising Core Web Vitals, website owners can significantly improve the overall user experience. Faster loading times, quicker interactivity, and stable visual elements lead to increased user satisfaction, decreased bounce rates, and higher engagement metrics.
  • Improved Search Engine Rankings: Core Web Vitals have become a crucial ranking factor in Google's search algorithm. Websites that provide better user experiences and meet the recommended thresholds for these metrics are more likely to rank higher in search results. Prioritising Core Web Vitals optimisation can positively impact organic visibility and attract more traffic to a website.
  • Competitive Advantage: With Core Web Vitals becoming an industry standard for user experience, businesses that prioritise optimisation gain a competitive edge. By delivering seamless experiences, websites can differentiate themselves from their competitors, build trust with users, and encourage repeat visits.

Strategies for Optimising Core Web Vitals

  • Minimise Server Response Time: Optimise server configurations, leverage content delivery networks (CDNs), and employ caching techniques to reduce the time it takes for the server to respond to user requests.
  • Compress and Optimise Assets: Compress images, minify JavaScript and CSS files, and optimise code to reduce file sizes and improve loading times.
  • Prioritise Above-the-Fold Content: Ensure that the most critical content of a webpage is loaded and rendered quickly, allowing users to access essential information without delay.
  • Lazy Loading: Implement lazy loading techniques to defer the loading of non-critical resources, such as images or videos, until they become visible on the user's screen.
  • Optimise JavaScript Execution: Optimise JavaScript code and eliminate render-blocking scripts that may delay page interactivity.
  • Design for Responsive Layouts: Create responsive designs that adapt seamlessly to different screen sizes and orientations, preventing unexpected layout shifts.
Core Web Vitals play a crucial role in shaping the user experience landscape on the web. Website owners and developers may construct faster, more responsive, and visually stable websites that resonate with users by prioritising the optimisation of these parameters. There are numerous advantages, ranging from increased user engagement and loyalty to higher search engine results. Adopting the power of Core Web Vitals is no longer an option for businesses who wish to thrive in the digital sphere and create outstanding user experiences.

What are Core Web Vitals?

Core Web Vitals are user-centric metrics that measure website performance, responsiveness, and user experience.

Why are Core Web Vitals important?

Optimising Core Web Vitals leads to improved user experience, higher search engine rankings, and a competitive advantage in the digital landscape.

How do Core Web Vitals affect SEO?

Websites that prioritise Core Web Vitals optimisation tend to rank higher in search results and attract more organic traffic.

How can I improve Largest Contentful Paint (LCP)?

Reducing server response time, optimising images, and implementing caching techniques can help improve LCP.

What is the First Input Delay (FID)?

FID measures the time it takes for a webpage to respond to a user's first interaction. Minimising FID ensures a more responsive website.

How can I reduce Cumulative Layout Shift (CLS)?

Designing for responsive layouts, avoiding sudden element shifts, and using proper image dimensions can minimise CLS.

What benefits does Core Web Vitals optimisation offer?

Optimising Core Web Vitals improves user satisfaction, lowers bounce rates, increases engagement metrics, and boosts organic visibility.

Can lazy loading help improve Core Web Vitals?

Implementing lazy loading techniques for non-critical resources can enhance page loading times and positively impact Core Web Vitals.

How can I optimise JavaScript execution for better Core Web Vitals?

Optimising JavaScript code and eliminating render-blocking scripts can improve page interactivity and FID.

Does responsive design affect Core Web Vitals?

Designing responsive layouts ensures consistent visual stability and helps prevent unexpected layout shifts (CLS).

Should I prioritise Core Web Vitals optimisation?

Prioritising Core Web Vitals is essential for delivering exceptional user experiences and staying competitive in the digital realm.

How can Core Web Vitals impact user engagement?

By providing faster loading times, responsive interactivity, and stable visuals, Core Web Vitals contributes to increased user engagement and loyalty.

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