UnitedSEO2020 Core Web Vitals: Optimising for Speed, Stability, and Interactivity

Core Web Vitals: Optimising for Speed, Stability, and Interactivity

 Core Web Vitals: The Foundation of a Fast and User-Friendly Site

Core Web Vitals are a set of 3 or three key metrics that measure a page's user experience.  They focus on three aspects: loading speed (Largest Contentful Paint), interactivity (First Input Delay), and visual stability (Cumulative Layout Shift). By optimising these metrics, website owners can improve site performance, boost user satisfaction, and enhance visibility in search engine rankings, ultimately driving better engagement and conversions.


Optimising for Speed, Stability, and Interactivity
 Speed, Stability, and Interactivity

What are Core Web Vitals?

Core Web Vitals are a set of 3 prime metrics that measure a page's user experience. As prime components of Google's page experience ranking signals, they significantly impact your website's search engine visibility.

Core Web Vitals are a set of three key metrics that measure a page's user experience that include,

  1. LCP (Largest Contentful Paint): Measures loading speed.
  2. INP (Interaction to Next Paint): Assesses interactivity.
  3. CLS (Cumulative Layout Shift): Evaluates visual stability.

Optimising these metrics enhances your site's visibility in search results and significantly boosts user engagement. 70% of consumers report that page speed influences their purchasing decisions with online retailers. Even a 0.1-second improvement in site speed can increase conversions by up to 8.4%, making performance optimisation a critical factor for online success.


What is the Google page experience update?

The Google Page Experience update is an algorithm change to enhance how Google evaluates and ranks web pages based on user experience. Launched in stages starting mid-2021, this update prioritises websites that deliver a smooth, user-friendly experience. It uses a mix of Core Web Vitals along with other existing signals, such as:

  • Core Web Vitals Focuses on loading speed (LCP), interactivity (INP), and visual stability (CLS).
  • Mobile-Friendliness: Ensures the site is optimised for mobile devices.-
  • HTTPS Security: Requires the use of secure connections (HTTPS).
  • Intrusive Interstitials: Penalises pages with intrusive pop-ups or ads that disrupt user interaction.
  • Safe Browsing: Checks for harmful or deceptive content.

With these factors, SEO aims to reward sites for user comfort and engagement, ultimately helping them rank higher in search results. This shift highlights Google's focus on ensuring fast, secure, and user-friendly websites.


Why do we need Core Web Vitals for any website?

Core Web Vitals are essential for any website because they directly impact user experience and search engine visibility. Here's why they matter:

  • Improved User Experience: Core Web Vitals focus on loading speed, interactivity, and visual stability. By optimising these metrics, you create a smoother, more engaging experience that keeps visitors on your site longer and reduces bounce rates.
  • Higher Search Rankings: Google uses Core Web Vitals for its ranking algorithm. Websites that meet these performance standards are more likely to rank higher in search results, driving more organic traffic.
  • Increased Conversion Rates: Faster, more responsive websites for better user satisfaction. Studies show that even a slight improvement in page speed can significantly boost conversion rates, with users more likely to complete purchases or sign-ups.
  • Mobile Optimisation: Core Web Vitals are especially crucial for mobile users, who expect fast and seamless browsing experiences. A well-optimised site ensures you retain mobile visitors, who now make up a significant portion of web traffic.
  • Competitive Advantage: With many websites competing for users' attention, optimising Core Web Vitals gives you an edge. A site that loads quickly and functions smoothly sets you apart from competitors, enhancing brand reputation and trust.

In short, Core Web Vitals are technical metrics—they are prime for creating a website that is user-friendly, competitive, and aligned with Google's standards, ultimately driving growth and success online.


How does an SEO can improve Google Core Web Vitals?

An SEO specialist can improve Google Core Web Vitals by implementing several optimisation strategies that enhance page performance and user experience.

Here is how:

Optimise Largest Contentful Paint (LCP):

  • Improve Server Response Time: SEO can use fast web hosting, optimise server resources, and enable caching to reduce delays.

Use a Content Delivery Network (CDN):

Distribute content across multiple servers globally to serve users' locations faster.

  • Optimise Images: SEO can compress and resize images, use modern formats like WebP, and implement lazy loading to prevent large files from slowing down the page.
  • Minimise CSS and JavaScript: Remove unused code, minify files, and delay non-critical CSS to speed up loading.

Enhance Interaction to Next Paint (INP):

  • Reduce JavaScript Execution Time: Minimise heavy JavaScript files, split code into smaller chunks, and use asynchronous loading to improve responsiveness.
  • Implement Browser Caching: Store frequently accessed files in the browser cache to reduce the load time for returning visitors.
  • Optimise Third-Party Scripts: Limit or delay the loading of third-party scripts (like ads and social media widgets) that can delay interactivity.
  • Prioritise User Input: SEO can ensure that user interactions like button clicks and form submissions are processed quickly.

Improve Cumulative Layout Shift (CLS):

  • Set Size Attributes for Media: Define width and height attributes for images, videos, and iframes that prevent unexpected shifts during page load.
  • Use Stable Elements: Reserve space for dynamic content like ads or banners to avoid shifting other elements on the page.
  • Avoid Injecting Content Above the Fold: SEO can prevent adding new content above visible content and can push elements down unexpectedly.
  • Minimise Font Swaps: Seo can use font display and swap for web fonts to prevent layout shifts caused by slow-loading fonts.

General Best Practices:

  • Enable Gzip or Brotli Compression: Compress files to reduce their size and speed up delivery.
  • Use Preloading and Prefetching: Preload critical resources like fonts and prime CSS files to improve load times.
  • Implement AMP (Accelerated Mobile Pages): Using AMP can improve loading speeds and mobile experience for mobile users.

With these optimisation techniques, an SEO can significantly enhance Core Web Vitals, leading to better search engine rankings, improved user satisfaction, and higher conversion rates.


How do Google Core Web Vitals influence SEO and website rankings?

Optimising for Google Core Web Vitals can significantly boost a page's rankings in search engine results pages (SERPs) for several reasons:

  • Direct Ranking Factor: Google has explicitly stated that Core Web Vitals are a ranking factor in its algorithm. Websites that load faster and offer smoother user experiences are more likely to engage visitors, leading to better rankings.
  • Enhanced User Experience: By providing a positive browsing experience, optimised sites with reduced bounce rates. This signals to search engines that the website is high-quality and relevant, which can improve its position in search results.
  • Increased Conversion Rates: Sites that excel in Core Web Vitals typically see higher conversion rates. Search engines take metrics into account, recognising that better-performing sites drive more user actions.
  • Optimised for Crawlers: Improved Core Web Vitals contribute to faster loading times and a streamlined site structure, making it easier for search engine crawlers to index pages efficiently. 

Focusing on Core Web Vitals enhances SEO performance and elevates the overall user experience, making your site more competitive in search rankings.


Why Core Web Vitals Matter for Success
Why Core Web Vitals Matter for Success


How do Core Web Vitals impact technical SEO?

Core Web Vitals and Technical SEO

Core Web Vitals are prime for technical SEO, as they directly influence a website's performance, user experience, and search engine rankings. Here is how they intersect:

  • Improving Page Speed: Core Web Vitals focus on metrics like Largest Contentful Paint (LCP), which measures loading speed. Technical SEO can boost LCP scores with better server response times, leveraging browser caching and compressing files.
  • Enhancing Interactivity: The Interaction to Next Paint (INP) metric assesses how quickly a site responds to user actions. Technical SEO practices like optimising JavaScript, reducing third-party scripts, and improving resource loading can boost interactivity and better INP scores.
  • Boosting Visual Stability: Cumulative Layout Shift (CLS) measures how much page elements shift during loading. Technical SEO can address this by setting size attributes for images, videos, and ads, ensuring content loads predictably without sudden shifts.
  • Optimising Mobile Experience: Core Web Vitals are especially important for mobile SEO, where page speed and responsiveness are crucial. Accelerated Mobile Pages (AMP) and ensuring mobile-friendly design enhance Core Web Vitals and mobile SEO.
  • Streamlining Site Architecture: Technical SEO focuses on efficient site architecture, which helps search engine crawlers navigate and index your content more effectively. By optimising Core Web Vitals, you ensure a faster, smoother experience that benefits both users and search engine bots.
  • Enhancing Crawl Efficiency: Fast-loading pages with optimised Core Web Vitals allows search engine crawlers to cover more of your site in less time, improving your chances of ranking higher and increasing the number of indexed pages.

In summary, Core Web Vitals are an integral part of technical SEO, as they help ensure that your website is fast, responsive, and user-friendly. Optimising these valid metrics can lead to better search rankings, higher user engagement, and higher conversion rates. 


PageSpeed Insights is a powerful tool that offers a comprehensive analysis of your website's performance. It provides actionable insights into factors like loading speed, interactivity, and visual stability. By understanding these metrics, you can optimise your website to deliver a user experience and boost your search engine rankings.

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