What is Core Web Vitals?
A set of specific standardized metrics created by Google that measure real-world user experience for web page loading speed (LCP), interactivity responsiveness (INP), and visual stability (CLS).
The Three Pillar Metrics
Google uses Chrome User Experience Report (CrUX) data from real users to grade pages: Largest Contentful Paint (LCP) measures perceived load speed (target < 2.5s); Interaction to Next Paint (INP) measures UI responsiveness to clicks and taps (target < 200ms); Cumulative Layout Shift (CLS) measures unexpected visual layout jumps (target < 0.1).
Websites that pass all three Core Web Vitals receive an algorithmic ranking boost in Google mobile and desktop search results.
Key Advantages & Impact
- Official Google search engine ranking signal affecting organic visibility
- Directly correlates with higher conversion rates and lower bounce rates on e-commerce and SaaS apps
- Reduces mobile data consumption by incentivizing next-gen WebP/AVIF image formats and pre-rendering
Common Misconceptions vs Reality
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Frequently Asked Questions
Why did Google replace FID with INP in 2024?
First Input Delay (FID) only measured the delay of the very first user interaction. Interaction to Next Paint (INP) monitors all interactions across the entire lifecycle of the user page visit, providing a much more accurate reflection of web responsiveness.