Core Web Vitals
Design Processes
Google's three measures of how a page feels to load and use.
In practice
Core Web Vitals are the performance signals Google uses to judge real-world page experience: Largest Contentful Paint for loading, Interaction to Next Paint for responsiveness, and Cumulative Layout Shift for visual stability. They are measured from actual visitors, they affect search ranking, and they turn a vague sense of 'fast' into three numbers you can be held to.
Questions
What is Core Web Vitals?
Core Web Vitals are three user-centred metrics — LCP, INP and CLS — that quantify loading speed, interaction responsiveness and layout stability.
Why do you use Core Web Vitals?
They are what Google means by page experience, so they influence ranking — and they correlate with whether people stay.
How do you use/apply Core Web Vitals?
Measure in the field with real-user data, find what is slow or shifting, fix the heaviest offenders first, and re-measure. Lighthouse gives a lab preview.
When do you use Core Web Vitals?
Continuously, and especially before and after any change to images, fonts, scripts or layout.
Who uses Core Web Vitals?
Front-end developers, designers who choose the assets, and anyone accountable for search performance.
