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Core Web Vitals in 2023: Ensuring Optimal User Experience for Better Rankings

Why Core Web Vitals Matter

Core Web Vitals are a set of metrics introduced by Google to measure the quality of user experience on a website. These metrics are crucial for website owners and developers as they directly impact search rankings. Studies have shown that better Core Web Vitals lead to improved user engagement and business metrics. For instance, when a site meets the Core Web Vitals thresholds, users are 24% less likely to abandon the page load.

Key Metrics of Core Web Vitals

  1. LCP (Largest Contentful Paint): This metric measures the time it takes for the largest content element visible in the viewport to render. It indicates how quickly a visitor sees that the URL is loading. The ideal LCP is less than 2.5 seconds.

  2. FID (First Input Delay): FID calculates the time from when a user first interacts with your page to the time when the browser responds to that interaction. This metric is crucial for pages where user interaction is vital. The recommended FID is less than 100 milliseconds.

  3. CLS (Cumulative Layout Shift): CLS gauges the total of all individual layout shift scores for every unexpected layout shift during the entire lifespan of the page. A lower CLS indicates a more stable page. The optimal CLS score is less than 0.1.

  4. INP (Interaction to Next Paint): A newer metric set to replace FID in 2024, INP assesses a page's overall responsiveness to user interactions.

Understanding the Core Web Vitals Report

The Core Web Vitals report in Google Search Console provides insights into how your pages perform based on real-world usage data. The report categorizes URL performance into three statuses: Poor, Need Improvement, and Good. These statuses are determined by the metrics LCP, FID, INP, and CLS.

How to Improve Core Web Vitals

  1. Reduce Page Size: Aim for a page size of less than 500KB, including all its resources. Limit the number of resources on a page to 50 for optimal mobile performance.

  2. Optimize Images and Videos: Large media files can significantly impact LCP. Compress and optimize images and videos to ensure they load faster.

  3. Address Layout Shifts: To improve CLS, ensure that elements on your page don't move unexpectedly. This can be achieved by specifying dimensions for images and videos and avoiding inserting content above existing content.

  4. Optimize Interactivity: To enhance FID and INP, minimize the use of heavy JavaScript, and break up long tasks.

  5. Use Tools: Utilize tools like Lighthouse, PageSpeed Insights, and the Chrome DevTools to identify and fix issues related to Core Web Vitals.


Core Web Vitals are becoming increasingly important in the realm of SEO. By understanding and optimizing these metrics, website owners and developers can not only provide a better user experience but also improve their search rankings.


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