What Are Core Web Vitals?

Core Web Vitals are a set of specific factors that Google considers essential for delivering a great user experience. These metrics measure key aspects of how users interact with a webpage, focusing on performance, responsiveness, and visual stability. The three Core Web Vitals include:

1. Largest Contentful Paint (LCP): Measures loading performance, indicating how long it takes for the largest visible content on the page to fully load. A good LCP score is 2.5 seconds or faster.
2. Cumulative Layout Shift (CLS): Tracks visual stability by measuring unexpected shifts in page content as it loads. A good CLS score is less than 0.1.
3. Interaction to Next Paint (INP): Replaces First Input Delay (FID) as of March 2024. It measures the time from user interaction to the browser’s next paint, providing a more holistic view of page responsiveness. A good INP score is under 200 milliseconds.

Together, these metrics aim to quantify the user experience and are a crucial part of Google’s Page Experience update, which impacts search rankings.

How to Analyze Core Web Vitals

To optimize Core Web Vitals, the first step is understanding how to evaluate your site’s performance using reliable tools. Here’s how you can analyze Core Web Vitals:

1. Use Google Zoekresultaten

Google Search Console provides a dedicated Core Web Vitals report, which highlights performance issues for your URLs on both mobile and desktop devices.

• What It Does: Categorizes URLs as “Good,” “Needs Improvement,” or “Poor” based on thresholds for LCP, CLS, and INP.
• How to Use It: Identify underperforming pages and prioritize them for improvement.

2. PageSpeed Insights

This tool gives detailed insights into each Core Web Vital and suggests improvements.

• Real-World Data: Provides metrics based on real user data (Field Data) from the Chrome User Experience Report (CrUX).
• Lab Data: Simulates a user’s experience to highlight potential bottlenecks.

3. Lighthouse

Available as part of Chrome DevTools, Lighthouse is an open-source tool that audits web performance and generates a detailed report.

Benefits: Offers actionable suggestions for improving LCP, CLS, and INP.

4. Other Tools for Monitoring

• WebPageTest: Detailed diagnostics, including render times and layout shifts.
• GTmetrix: Performance grades and improvement tips tailored to Core Web Vitals.

How to Improve Core Web Vitals

Once you’ve identified areas for improvement, here’s how you can enhance each Core Web Vital:

1. Improving Largest Contentful Paint (LCP)

• Afbeeldingen optimaliseren: Use modern formats like WebP or AVIF to reduce file sizes.
• Render-belemmerende bronnen minimaliseren: Defer or remove non-critical JavaScript and CSS.
• Use a Content Delivery Network (CDN): Deliver content faster by leveraging geographically distributed servers.
• Server Optimization: Reduce server response times by upgrading hosting or implementing caching mechanisms.

2. Reducing Cumulative Layout Shift (CLS)

• Set Size Attributes for Images and Videos: Define width and height in CSS or HTML to reserve space.
• Avoid Late-Loading Elements: Avoid injecting dynamic content or ads above the fold without pre-allocated space.
• Use Stable Fonts: Utilize font-display: swap to prevent layout shifts during font loading.

3. Optimizing Interaction to Next Paint (INP)

• Minimize JavaScript Blocking: Break long tasks into smaller chunks to avoid delays.
• Optimize Event Handlers: Simplify and reduce the execution time of interactive event handlers.
• Provide Immediate Feedback: Use visual indicators, like button states, to assure users their input is being processed.