Core Web Vitals

What is Core Web Vitals?

Core Web Vitals measure real-user experience for loading (LCP), interactivity (INP, formerly FID), and visual stability (CLS). They are part of Google’s page experience signals.

Example: A product page where the main image loads in 4 seconds, buttons delay on first tap, and ads shift the layout scores poorly—hurting UX and potentially page experience evaluation.

Why Core Web Vitals matters

Core Web Vitals matter because slow, janky pages lose conversions and can undermine page experience signals tied to real users. They’re a shared language for dev and marketing to prioritize fixes.

How Core Web Vitals works in digital marketing

Optimize images and fonts, reduce main-thread work, stabilize layout with reserved space for embeds, and test with field data (CrUX) plus lab tools.