# Core Web Vitals explained: LCP, INP and CLS in five minutes

> Core Web Vitals in plain language: what LCP, INP and CLS measure, the scores Google considers good, and how to improve each one.

By [Jon Brockett](https://digitalrocket.co/about), Founder & Lead Developer · Published 2026-07-13 · Canonical page: https://digitalrocket.co/insights/core-web-vitals-explained

The three numbers Google uses to judge page experience, and how to improve each one.

[Jon Brockett](https://digitalrocket.co/about) Founder & Lead Developer · 20+ years in web

July 13, 2026 · 5 min read

Core Web Vitals are three measurements Google uses to judge how your site feels to real visitors. They’re part of Google’s page experience signals, and more importantly, they track closely with whether people stay or leave.

Google measures them from real Chrome users visiting your site, and judges you at the 75th percentile. That means your site needs to be fast for most visitors, not just on your office Wi-Fi.

## LCP: how fast the main content appears

Largest Contentful Paint measures how long it takes for the biggest thing on screen, usually a hero image or headline, to show up. Good is 2.5 seconds or less.

- Compress and resize images, and serve modern formats like WebP or AVIF.
- Don’t lazy-load the main hero image; load it first.
- Use good hosting and a CDN so pages start arriving quickly.

## INP: how fast the page responds

Interaction to Next Paint measures how quickly your page reacts when someone taps a button, opens a menu or types in a field. Good is 200 milliseconds or less. INP replaced the older First Input Delay metric in March 2024.

- Cut unused plugins and third-party scripts, like old chat widgets and tracking pixels.
- Break up heavy JavaScript so the browser isn’t tied up.
- Be wary of page builders that load a lot of code on every page.

## CLS: how much the page jumps around

Cumulative Layout Shift measures unexpected movement, like when you go to tap a link and an ad loads above it. Good is 0.1 or less.

- Set width and height on images and videos so space is reserved.
- Reserve space for banners, embeds and ads before they load.
- Load web fonts in a way that doesn’t reflow text.

Quick check

Paste your homepage into PageSpeed Insights (pagespeed.web.dev). The “Discover what your real users are experiencing” section at the top shows your actual Core Web Vitals. The score below it is a lab test and matters less.

## How much does it matter for rankings?

Honestly: great content on a slow site will usually outrank thin content on a fast one. But when competitors are close, page experience can be the tiebreaker, and speed has a much bigger effect on whether visitors call you once they arrive.

Want faster pages without the guesswork? See [how we speed up websites](https://digitalrocket.co/website-speed).

ABOUT THE AUTHOR

Jon Brockett

Founder and lead developer of DigitalRocket in Syracuse. Jon has spent more than 20 years building websites and software, including over a decade at Syracuse advertising agencies, and now helps Central New York businesses put AI to work, connect their tools with custom software, and run fast, secure websites.

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