Web Development

What is Core Web Vitals?

Core Web Vitals are a set of three performance metrics defined by Google to measure the real-world user experience of a web page.

Definition

Core Web Vitals are a set of three performance metrics defined by Google to measure the real-world user experience of a web page: Largest Contentful Paint or LCP which measures loading speed, Interaction to Next Paint or INP which measures responsiveness to user input, and Cumulative Layout Shift or CLS which measures visual stability. Google uses these metrics as ranking signals — sites that perform well are rewarded with a ranking boost, while poor performance can suppress visibility.

Why It Matters for Small Businesses

A slow, unresponsive, or visually unstable website frustrates visitors and hurts rankings simultaneously. For small businesses competing for local search visibility, Core Web Vitals performance is one of the technical factors that can tip the balance in competitive search results. Beyond rankings, a better-performing site simply converts more visitors.

Example

A boutique hotel website has beautiful photography but terrible LCP scores because images are not optimized. Visitors on mobile see a blank page for 4 seconds before anything loads and most leave. After optimizing images, implementing lazy loading, and upgrading hosting, LCP drops to under 2.5 seconds and direct booking conversions increase significantly.

Related Terms

Page SpeedThe broader concept Core Web Vitals are part of

Lazy LoadingAn image optimization technique that improves LCP

Web HostingServer performance directly affects Core Web Vitals scores

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