Skip to content
ideas2pixels
Performance

Core Web Vitals Explained: LCP, INP and CLS for Small Business Owners

Core Web Vitals sound technical, but they measure three things visitors notice at once: how quickly the page appears, how quickly it reacts when you tap, and whether it stays still while it loads. Google uses them as part of how it judges page experience, and they are a good checklist for any small site.

By the ideas2pixels team

6 min read

Three gauges labelled LCP, INP and CLS, showing the Core Web Vitals scores of a fast website.

01

LCP: how fast the main content appears

Largest Contentful Paint measures how long the biggest thing on the screen, usually a hero image or a heading, takes to show. Google treats 2.5 seconds or less as good.

  • Compress photos and serve them at the size they are shown.
  • Do not load a huge slider or video above the fold.
  • Use good hosting, because a slow server delays everything after it.

02

INP: how quickly the page responds

Interaction to Next Paint replaced the older First Input Delay measure in March 2024. It looks at how long the page takes to respond when someone taps a menu, opens a form or presses a button, and a good result is 200 milliseconds or less.

Heavy scripts are the usual cause. Chat widgets, tracking tags, pop-ups and animation libraries all compete for the same phone processor. Remove what you do not use, and load the rest after the page is usable.

03

CLS: whether the page jumps around

Cumulative Layout Shift scores how much the page moves while it loads. You know the feeling: you go to tap a link and an advert or image pushes it down. A score of 0.1 or lower is good.

Give images and embeds a set width and height so the browser saves space for them, and avoid inserting banners above content that has already loaded.

04

How to check your own scores

Google's PageSpeed Insights shows your Core Web Vitals for a page, using real visitor data when there is enough traffic and a lab test when there is not. Search Console has a Core Web Vitals report for your whole site. Check on a phone, not just a desktop, because that is where most problems appear.

Fixing speed rarely means a rebuild. Our guide on why website speed matters has the quick wins, and every site we build starts lean so there is less to fix later.

Common questions

Do Core Web Vitals affect rankings?

They are part of Google's page experience signals, but relevance and content quality matter more. A slow site still loses visitors, so the speed work pays off either way.

What replaced First Input Delay?

Interaction to Next Paint (INP) replaced it as a Core Web Vital in March 2024.

Is a score of 100 in PageSpeed Insights necessary?

No. Aim for the Core Web Vitals to pass, and treat the overall score as a guide rather than a target.

Want us to build it for you?

One setup fee, then a simple monthly plan with your domain, hosting, support and edits included.

See packages →Ask a question

Keep reading