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Core Web Vitals SEO

The Ultimate Guide To Core Web Vitals SEO

Core Web Vitals, a set of specific metrics introduced by Google, stand at the forefront of web performance evaluation, shaping the digital landscape for website owners and developers. Understanding and optimizing for Core Web Vitals SEO is paramount for ensuring websites offer an optimal user experience and maintain competitiveness in search rankings. 

Join seobase as we explore the significance of Core Web Vitals SEO and delve into lesser-known reasons why they are crucial for website owners and developers.


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What are Core Web Vitals?

Core Web Vitals are a set of specific metrics designed by Google to measure the user experience of a website. They focus on three fundamental aspects of web page performance: loading speed, interactivity, and visual stability. These metrics are crucial for assessing and improving website visitors' overall usability and satisfaction. Let's delve into each of the Core Web Vitals SEO:

Largest Contentful Paint (LCP)

  • LCP measures the loading speed of a web page by determining the time it takes for the most significant content element, such as an image or text block, to become visible to the user.

  • It reflects how quickly users can access the main content of a page, influencing their perception of its speed and responsiveness.

  • A good LCP score indicates that the main content loads swiftly, typically within 2.5 seconds of the page starting to load.

First Input Delay (FID)

  • FID evaluates the interactivity of a web page by measuring the time it takes for the page to respond to a user's first interaction, such as clicking a link or tapping a button.

  • It quantifies the delay between the user's action and the browser's response, reflecting the page's responsiveness and user engagement.

  • An optimal FID score is typically less than 100 milliseconds, indicating that the page is highly responsive to user input.

Cumulative Layout Shift (CLS)

  • CLS assesses the visual stability of a web page by measuring the amount of unexpected layout shifts that occur during the page's loading process.

  • It quantifies the extent to which page elements, such as images or ads, move around unexpectedly, potentially causing frustration for users.


  • A desirable CLS score is less than 0.1, indicating minimal visual instability and a smooth user browsing experience.

Core Web Vitals SEO collectively provides insights into a web page's overall performance, responsiveness, and visual stability, reflecting the user's experience while interacting.

Read: Google's Core Web Vitals: What They Mean for Your SEO

what is core web vitals

Core Web Vitals Impact on SEO

Introducing Core Web Vitals SEO as a ranking factor significantly impacts SEO strategies. Website owners and developers must prioritize optimizing their sites to meet these performance metrics to enhance visibility and maintain competitiveness in search results. Here's how Core Web Vitals affect SEO:

Improved user experience

By focusing on Core Web Vitals SEO, websites can deliver better user experiences. A positive user experience leads to higher rankings, increased user engagement, reduced bounce rates, and improved conversion rates.


With the proliferation of mobile devices, Google emphasizes mobile-first indexing and considers mobile-friendliness a crucial aspect of the user experience. Websites prioritizing mobile optimization and achieving high Core Web Vitals SEO scores will likely perform better in search rankings, especially for mobile searches.

Competitive advantage

Websites that proactively optimize for Core Web Vitals SEO gain a competitive edge in search rankings. By surpassing competitors in user experience, they are more likely to attract and retain visitors, driving organic traffic and leading to better SEO performance.

Algorithmic shifts

Google's algorithms continuously evolve to reflect changing user behavior and preferences. Core Web Vitals SEO represents Google's commitment to rewarding websites that prioritize user experience, signaling a broader shift towards user-centric ranking factors in SEO.

Past Google Updates That You Need To Know About 

In recent years, several updates have significantly impacted SEO and influenced the optimization of Core Web Vitals SEO. Let's delve into some of these updates:

1. Google Mobile-First Indexing (2018)

Google's shift towards mobile-first indexing signaled a fundamental change in how it evaluates and ranks websites. With this update, Google primarily uses the mobile version of a website's content for indexing and ranking. Key factors considered include mobile responsiveness, page load speed, and overall user experience.

2. Google Speed Update (2018)

The Speed Update emphasized page speed as a ranking factor, especially for mobile searches. Faster-loading pages, particularly those optimized for Core Web Vitals  SEO like loading performance (LCP), gained an advantage in search results.

3. Google BERT Algorithm (2019)

BERT (Bidirectional Encoder Representations from Transformers) improved the understanding of search queries in context, enhancing the relevance and accuracy of search results. While not directly related to Core Web Vitals SEO, BERT emphasized the importance of producing high-quality, relevant content aligned with user intent.

4. Google Passage Indexing (2020)

Passage indexing allowed Google to index individual passages within web pages, enhancing search result precision. Though not directly linked to Core Web Vitals SEO, passage indexing highlighted the importance of providing valuable and informative content aligned with user queries.

5. Google's Page Experience Update (2021)

In May 2021, Google introduced its Page Experience Update, which integrated Core Web Vitals SEO  into its ranking signals. This update prioritizes websites that offer users a seamless and enjoyable browsing experience. 

Read: How to Stay Up to Date with Google Algorithm Updates?

google's page experience update

Optimizing for Core Web Vitals

Achieving optimal Core Web Vitals SEO scores requires technical expertise, strategic planning, and ongoing monitoring. Here are some key strategies to optimize for Core Web Vitals:

Performance optimization

  • Minimize Server Response Times: Utilize efficient server infrastructure and optimize backend code to reduce server response times for Core Web Vitals SEO.

  • Leverage Browser Caching: Set appropriate cache-control headers to instruct browsers to cache static resources, reducing the need for repeated downloads.

  • Optimize Resource Delivery: Compress images, minify CSS and JavaScript files, and use techniques like lazy loading to deliver resources efficiently.

Code efficiency

  • Reduce Render-Blocking Resources: Identify and defer non-critical JavaScript and CSS resources to prevent them from blocking page rendering.

  • Enhance Page Responsiveness: Utilize modern web development techniques such as asynchronous loading and code splitting to improve First Input Delay (FID) and overall interactivity.

Content layout

  • Specify Image and Media Dimensions: Always include width and height attributes for images and other media elements to prevent layout shifts as content loads for Core Web Vitals SEO.

  • Avoid Third-Party Embeds: If possible, host videos and other media content directly rather than relying on third-party embeds, which can introduce unexpected layout changes.

Mobile responsiveness

  • Responsive Design: Design and develop with a mobile-first approach, ensuring that the layout and content adapt seamlessly across various screen sizes and devices.

  • Optimize Viewport Settings: Correct viewport meta tags to ensure proper scaling and rendering on mobile devices.

  • Mobile-Friendly Navigation: Simplify navigation menus and ensure touch targets are appropriately sized for easy navigation on touchscreen devices.

Continuous monitoring

  • Set Up Alerts: Configure alerts to notify you of sudden changes or performance regressions, allowing you to address issues promptly.

  • Regular Audits: Conduct periodic audits of your website's performance to ensure that optimizations remain effective and address any new issues.

By implementing these strategies and continuously monitoring your website's performance, you can effectively optimize for Core Web Vitals SEO and provide a better user experience for your visitors across various devices and network conditions.

Read: 5 SEO Case Studies To Help You Improve Your Strategy

Tools for Monitoring 

Several tools are available for monitoring Core Web Vitals SEO and assessing the overall performance of your website. Here are some popular options:

Google PageSpeed Insights

Google PageSpeed Insights provides detailed insights into your website's performance, including Core Web Vitals metrics. It offers suggestions and recommendations for improving performance based on Google's best practices and guidelines.

Google Search Console

Google Search Console includes a Core Web Vitals report that allows you to monitor the performance of your website's pages in terms of loading speed, interactivity, and visual stability. It provides data on how your pages perform, highlighting any issues or areas for improvement.


WebPageTest is a free online tool that allows you to test the performance of your website from multiple locations and devices. It provides detailed performance metrics, including Core Web Vitals SEO, as well as waterfall charts to visualize page loading and rendering.

Chrome DevTools

Chrome DevTools, built into the Chrome browser, includes various performance analysis tools to help you monitor Core Web Vitals SEO  in real-time. You can use features like the Performance panel to identify performance bottlenecks and measure Core Web Vitals metrics.


GTmetrix is a web performance monitoring tool that analyzes your website's speed and performance, providing actionable recommendations for improvement. It measures Core Web Vitals metrics and other performance indicators and offers insights into optimizing them.

Read: Best SEO Tools Every Marketer Should Use

core web vitals


Core Web Vitals SEO represents more than just a set of metrics for website performance—they are a cornerstone for success in the digital realm. 

Beyond their direct impact on SEO and user experience, Core Web Vitals contribute to accessibility compliance, global reach, energy efficiency, user engagement, and brand reputation. Additionally, they are intertwined with past Google updates that have reshaped the SEO landscape, underlining their significance in the ever-evolving digital ecosystem. 

By prioritizing optimization efforts for Core Web Vitals SEO and implementing best practices, website owners and developers can create a seamless and enjoyable browsing experience for users, ultimately driving success and growth in the digital sphere.

Keep up with seobase to learn all about SEO best practices!


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