Core Web Vitals: A Plain-English Guide for Business Owners
Understand Core Web Vitals (LCP, INP, CLS) without the jargon, why they matter for SEO and conversions, and how to improve them on your website.
Core Web Vitals are Google's way of measuring how fast and stable your website feels to real visitors. They influence both rankings and conversions — and the good news is they're fixable.
What are Core Web Vitals?
Core Web Vitals are three user-experience metrics Google uses as a ranking signal. They measure loading speed, interactivity and visual stability from the perspective of actual users.
The three metrics
- LCP (Largest Contentful Paint) — how quickly the main content loads. Aim for under 2.5 seconds.
- INP (Interaction to Next Paint) — how quickly the page responds to taps and clicks. Aim for under 200 milliseconds.
- CLS (Cumulative Layout Shift) — how much the page jumps around as it loads. Aim for under 0.1.
Why they matter
Fast, stable pages rank better and convert better. Slow sites lose visitors before they ever see your offer — every extra second of load time measurably reduces enquiries and sales. Core Web Vitals turn that user experience into something you can measure and improve.
How to improve them
- Compress and correctly size images; serve modern formats like WebP and AVIF.
- Reduce and defer unnecessary JavaScript.
- Reserve space for images and embeds to prevent layout shift.
- Use fast, reliable hosting and a CDN.
- Adopt a modern framework like Next.js that optimizes delivery by default.
The bottom line
Core Web Vitals are a rare SEO factor that also directly improves revenue. If your site is slow or unstable, fixing these metrics is one of the highest-ROI investments you can make.