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Core Web Vitals are a set of three performance metrics created by Google to measure real-world loading performance, visual stability, and page responsiveness. Google recommends improving these three core metrics for a better user experience and its ranking systems use them as a part of overall page experience. This guide explains each metric, its target, and how to check your own scores.
What Are Core Web Vitals?
Core Web Vitals are three metrics that measure how your website performs in three areas:
Loading Speed: How quickly the main content appears.
Interactivity: How quickly the page responds to your user actions.
Visual Stability: Whether the page layout stays in place while loading and is used.
Core Web Vitals Metrics: LCP, INP, and CLS
Each metric identifies a different problem that can affect how people use the web page.
| Metrics | Good | Needs Improvement | Poor | Why it matters |
| LCP | 2.5 seconds or less | 2.5 to 4 seconds | Over 4 seconds | Visitors can see the main content quickly instead of waiting for the page to load. |
| INP | 200 milliseconds or less | 200 to 500 milliseconds | Over 500 milliseconds | Interaction with the page becomes smooth without experiencing frustrating delays. |
| CLS | 0.1 or less | 0.1 to 0.25 | Over 0.25 | Visitors can read and interact with the page without unexpected layout movement. |
Largest Contentful Paint (LCP): It measures how long it takes for the largest visible content element to appear on the screen. The largest visible content is your website’s uploaded images, videos, or large block text elements.
Interaction to Next Paint (INP): INP measures how quickly a page from your website responds visually after a user clicks, taps, or uses keyboard interactions. It considers the interactions on the website from the visit, not only the first click.
Cumulative Layout Shift (CLS): Unexpected movement of visible page elements when the webpage is loading; its entire session window score is measured and shown as CLS.
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Do Core Web Vitals Affect Rankings?
Google’s main objective is to show users helpful and relevant content and provide them a good search experience. According to Google, Core Web Vitals align with what its core ranking systems seek to reward. But excellent Core Web Vitals are not guaranteed to rank higher than a website with a poor score and provide the best answer to the search query.
How to Check Your Website Core Web Vitals
Google uses real-world data from actual users to assess Core Web Vitals.
PageSpeed Insights: Enter a webpage URL into PageSpeed Insights and click Analyze to see its Core Web Vitals and recommendations for fixing performance issues.
Google Search Console: Open your verified Search Console property and click on the Core Web Vitals report to find groups of URLs with poor, needs improvement, or good performance separately for mobile and desktop. Only indexed URLs appear, and low-traffic sites do not have enough data.
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Final Words
Improve Core Web Vitals to remove unnecessary performance barriers. Check both the mobile and desktop reports in Search Console. Identify the affected URL groups and test a representative URL in PageSpeed Insights to improve performance issues.
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