core web vitals

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Sebastian Żarnowski
Co-founder & CEO
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What is core web vitals - Definition

Core Web Vitals are three key metrics that assess the quality of a website's user experience. They are part of Google's search algorithms that affect the ranking factors and visibility of sites in search results. Core Web Vitals are designed to help site owners deliver an optimal user experience, focusing on responsiveness, stability and page speed.

Core Web Vital

Metrics included in Core Web Vitals

Core Web Vitals consist of three key metrics that measure various aspects of site usage:

Largest Contentful Paint (LCP): Measures how long it takes a site to display the largest content on the screen. The optimal LCP score is less than 2.5 seconds. Longer LCP times can result from slow loading of images, CSS styles or JavaScript code.

First Input Delay (FID): Measures a site's interactivity by determining the response time to a user's first click or tap. The optimal FID time is less than 100 milliseconds. Longer FID times may be the result of suboptimal JavaScript code blocking response to user interactions.

Cumulative Layout Shift (CLS): Measures visual stability of a site's layout by assessing how much elements on a page shift their position during loading.

How to measure Core Web Vitals?

To check your site's Core Web Vitals, you can use tools provided by Google, such as Google Search Console and PageSpeed Insights. Google Search Console provides information on Core Web Vitals metrics for individual pages of your site. PageSpeed Insights, on the other hand, provides detailed reports of Core Web Vitals ratings and indicates which elements should be optimized to improve performance metrics.

Table of contest

Improving Core Web Vitals

To improve Core Web Vitals and the user experience of your site, you can take the following actions:

  1. Optimize images: Compress and optimize images to reduce their size and speed up page loading time.
  2. Caching: Use browser caching to speed up site loading for returning users.
  3. Code minimization: Remove unnecessary code and minimize page size to reduce page load time.
  4. Optimized rendering: Make sure your code is optimized so the site renders quickly and is ready for user interaction.

Impact of Core Web Vitals on SEO

The search engine giant stresses that quality of use is crucial for successful SEO, and sites that provide better Core Web Vitals can gain a competitive advantage in search results. Why is implementing Core Web Vitals important? Here are some aspects that explain it:

  • Positive User Experience: Core Web Vitals focus on parameters that affect the quality of the user experience. Google wants users to receive search results that are distinguished by the site's ease of use and loading speed. Websites that deliver an optimal user experience are more likely to rank better in search results.
  • Increasing organic traffic: Using Core Web Vitals to improve your site's user experience can help increase organic traffic. If a site loads quickly and is interactive, users are more likely to stay on the site, browse more content and perform relevant actions (e.g. purchase, fill out a form, etc.). This, in turn, can increase conversion rates and boost organic traffic.
  • Bonusing Optimal Sites: Google's algorithms are increasingly favoring websites that offer good Core Web Vitals. Websites that are responsive, fast and stable may have an advantage in the competition for better positions in search results. Google is constantly striving to improve the quality of search results, and Core Web Vitals are one of the factors that influence ranking decisions.
  • Increased click-through rate (CTR): From a user's point of view, sites that are known for their page load speed are more pleasant to use, so they can increase the click-through rate (CTR). Users are often more likely to click on search results that have a significant amount of information in a short amount of time. If a site responds to users' needs through fast loading and a properly designed interface, SEOs can see an increase in CTR and better results in search results.


Core Web Vitals have a positive impact on SEO and site ranking in search results. Improving these metrics will contribute to a better user experience, greater search engine visibility and more effective marketing efforts.

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