Google's Core Web Vitals measure real-world user experience across loading speed, visual stability, and interactive responsiveness. Passing these metrics is critical for search rankings and conversion rates.
The 3 Core Web Vitals Metrics Explained
| Metric | What It Measures | Good Threshold | Primary Engineering Fixes |
|---|---|---|---|
| LCP (Largest Contentful Paint) | Render time of largest hero element | ≤ 2.5 seconds | Preload hero images, optimize server TTFB, remove render-blocking CSS |
| CLS (Cumulative Layout Shift) | Visual stability / unexpected layout jumps | ≤ 0.1 | Explicit width/height on images and SVGs, reserve space for dynamic ads/embeds |
| INP (Interaction to Next Paint) | Responsiveness to user clicks and taps | ≤ 200 ms | Break up long JavaScript tasks, defer non-critical scripts, optimize event handlers |
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