Core Web Vitals are now a Google ranking factor. Learn how to optimize LCP, FID and CLS to boost your SEO and your conversion rate.
The Core Web Vitals are three essential metrics that Google uses to assess the user experience of your site. ## What are the Core Web Vitals? ### LCP (Largest Contentful Paint) Measures the loading time of the largest visible element. - **Good**: < 2.5s - **Needs improvement**: 2.5s - 4s - **Poor**: > 4s ### FID (First Input Delay) Measures responsiveness during the first interaction. - **Good**: < 100ms - **Needs improvement**: 100ms - 300ms - **Poor**: > 300ms ### CLS (Cumulative Layout Shift) Measures the visual stability of the page. - **Good**: < 0.1 - **Needs improvement**: 0.1 - 0.25 - **Poor**: > 0.25 ## Optimizing LCP 1. **Optimize your images** - WebP or AVIF format - Lazy loading - Explicit dimensions 2. **Preload critical resources** ```html ``` 3. **Minimize render-blocking CSS** ## Improving FID - Break up long JavaScript tasks - Use Web Workers for heavy computations - Defer non-essential scripts ## Reducing CLS - Always set width/height on images - Reserve space for ads - Avoid inserting content above the viewport ## Measurement tools - Google PageSpeed Insights - Chrome DevTools (Lighthouse) - Web Vitals extension Optimizing your Core Web Vitals is an investment that directly impacts your SEO and your conversion rate.
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