Core Web Vitals explained (for non-technical owners)
Core Web Vitals sound like something only a developer needs to care about. But they're Google's attempt to measure something very human: does this page feel fast and stable to use? They influence your ranking and your conversions, and you don't need to be technical to understand them. Here's the plain-English version.
The three metrics, in plain English
Google boils "how good does this page feel to use" down to three measurable things:
- LCP — Largest Contentful Paint. How long until the main content appears. It answers "when can I actually see the page?" Aim for under 2.5 seconds.
- INP — Interaction to Next Paint. How quickly the page responds when you tap or click. It answers "does it react when I touch it?" Aim for under 200 milliseconds.
- CLS — Cumulative Layout Shift. How much things jump around as the page loads. It answers "does the button move just as I go to tap it?" Aim for under 0.1.
Why Google cares (and you should too)
Google wants to send people to pages that are a good experience, so Core Web Vitals are a confirmed ranking signal. But the bigger reason to care is money: pages that load slowly or jump around lose visitors before they convert. A green score isn't about pleasing Google — it's about not quietly losing customers.
How to check yours
Run your site through Google PageSpeed Insights (free). It shows your Core Web Vitals from real-world data where available, and flags each one green, amber or red. Google Search Console has a Core Web Vitals report too, covering your whole site rather than one page.
What usually causes a fail
- Poor LCP — huge unoptimised images, slow hosting, or render-blocking code.
- Poor INP — heavy JavaScript that ties up the browser when you interact.
- Poor CLS — images and ads without reserved space, so content jumps as they load.
The good news: these are all fixable, and often quickly. You don't need to understand the engineering to act on it — you need to know the scores exist, check them, and get the red ones fixed. That's where a developer earns their keep.
Common questions
What are Core Web Vitals in simple terms?
They're three measures of how good a page feels to use: how fast the main content appears (LCP), how quickly it responds to a tap or click (INP), and how much it visually jumps around while loading (CLS). Google uses them to help rank pages.
Do Core Web Vitals affect SEO?
Yes — Google has confirmed they're a ranking signal. They're not the biggest factor (relevant content still matters most), but between similar pages the one with a better experience has the edge, and better vitals also mean better conversions.
How do I check my Core Web Vitals?
Use Google PageSpeed Insights for a single page, or the Core Web Vitals report in Google Search Console for your whole site. Both are free and show each metric as green, amber or red, with the issues behind any failures.
What is a good Core Web Vitals score?
Aim for LCP under 2.5 seconds, INP under 200 milliseconds, and CLS under 0.1. Hitting all three in the green, based on real-visitor data, is a "pass" — and a sensible baseline to build and maintain every site to.
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