Core Web Vitals are Google's way of measuring how a page feels to use. They reduce a complex experience to three numbers — and those numbers affect both rankings and conversions.
Loading (LCP)
Largest Contentful Paint measures how long the main content takes to appear. Aim for under 2.5 seconds. Oversized images and slow servers are the usual culprits.
Interactivity (INP)
Interaction to Next Paint tracks how quickly the page responds when you tap or click. Heavy JavaScript is what makes a site feel sluggish here.
Stability (CLS)
Cumulative Layout Shift measures how much things jump around as the page loads. Reserve space for images and ads so nothing leaps under a user's thumb.
The takeaway
Fast, responsive, and stable isn't a developer luxury — it's how visitors decide whether your business feels modern and trustworthy.