If you are asking, “How to check my Core Web Vitals?”, you are taking a crucial step toward improving your website’s user experience and search engine rankings.
Core Web Vitals are a set of specific metrics established by Google that measure real-world user experience for loading speed, interactivity, and visual stability. Passing these vitals is an official ranking factor for Google Search.
What Are the Three Core Web Vitals Metrics?
Before testing your site, it helps to understand what metrics you are measuring:
- Largest Contentful Paint (LCP): Measures loading performance. To provide a good user experience, LCP should occur within 2.5 seconds of when the page first starts loading.
- Interaction to Next Paint (INP): Measures responsiveness. INP evaluates how quickly a page responds to user interactions (clicks, taps, key presses). Good INP is 200 milliseconds or less.
- Cumulative Layout Shift (CLS): Measures visual stability. It quantifies how often users experience unexpected layout shifts while browsing. Good CLS is less than 0.1.
Top Tools to Check Your Core Web Vitals
Google provides several free, powerful tools to audit and monitor your Core Web Vitals performance:
1. Google PageSpeed Insights (PSI)
PageSpeed Insights is the most popular tool for checking individual page performance. Simply enter your URL, and PSI will provide lab data (simulated) and field data (real user experience from the Chrome User Experience Report) for both mobile and desktop.
2. Google Search Console (GSC)
For site-wide monitoring, Google Search Console has a dedicated Core Web Vitals report. It groups your pages into "Poor," "Needs Improvement," and "Good" categories based on real-world user data collected across Google Chrome.
3. Google Chrome Lighthouse
Built directly into Chrome DevTools (press F12), Lighthouse allows you to run audits locally on your staging or production site to diagnose performance bottlenecks and layout shifts before they affect real users.
How to Fix Poor Core Web Vitals Scores
If your test results show failing grades, focus on these high-impact fixes:
- Optimise and compress images (use WebP or AVIF formats)
- Minimise render-blocking JavaScript and CSS
- Upgrade hosting or implement reliable server caching
- Reserve explicit width and height dimensions for images and embeds to prevent layout shift (CLS)
- Defer non-critical third-party scripts
Frequently Asked Questions
How do I check my Core Web Vitals for free?
You can use Google PageSpeed Insights or Google Search Console completely free of charge.
Why do my lab data and field data differ?
Lab data is collected in a controlled environment with simulated device and network conditions, whereas field data reflects real-world experiences from visitors across varying devices and connection speeds.
Are Core Web Vitals an official ranking factor?
Yes, Google uses Core Web Vitals as part of its page experience signals in search ranking algorithms.