Core Web Vitals explained for business owners: LCP, INP and CLS
What Google's three page experience metrics measure, the scores to aim for, and the fixes that make the biggest difference.
Tech guideCore Web Vitals are three measurements Google uses to judge how a page feels to real visitors: how fast it loads, how quickly it responds, and whether it jumps around while loading. They are a small part of how Google ranks pages, but they have a big effect on whether visitors stay long enough to enquire.
LCP: how fast the main content appears
Largest Contentful Paint measures how long it takes for the biggest visible element — usually the hero image or headline — to appear. Aim for 2.5 seconds or less.
The usual culprits are oversized images, slow hosting and fonts or scripts that block the page from drawing. Serving images in WebP or AVIF at the right size, preloading the hero image and using a fast host or CDN fix most LCP problems.
INP: how quickly the page responds
Interaction to Next Paint measures the delay between a tap or click and the page visibly responding. Aim for 200 milliseconds or less. It replaced the older First Input Delay metric in 2024.
Poor INP almost always comes from too much JavaScript running in the browser — heavy page builders, chat widgets, tracking tags and sliders. Removing what you don't need and loading the rest after the page is usable are the main fixes.
CLS: whether the layout jumps around
Cumulative Layout Shift measures how much content moves unexpectedly while the page loads — the moment you go to tap a button and an ad pushes it down. Aim for 0.1 or less.
Give images and videos fixed dimensions, reserve space for banners and embeds, and load web fonts in a way that doesn't reflow the text. These are small code changes with a noticeable effect.
How to check your own site
Open PageSpeed Insights and enter your address. The top section shows field data from real Chrome users over the last 28 days, which is what Google uses; the lab score below is a simulation that's useful for spotting problems. Google Search Console also has a Core Web Vitals report that groups your pages into good, needs improvement and poor.
Check on mobile first. Most visitors to local business sites arrive on phones over mobile data, and that's where slow sites lose people.
Where to spend effort
Fix the pages that bring enquiries first — the homepage, main service pages and contact page. Passing Core Web Vitals won't push a weak page to the top of Google, but a slow, jumpy page will lose visitors that good content earned.
Frequently asked questions
Do Core Web Vitals affect Google rankings?
Yes, as part of Google's page experience signals, but relevance and content quality matter more. Their bigger impact is on how many visitors stay and convert.
Why does my PageSpeed score change every time I test?
The lab score is a single simulated run and varies with network conditions. The field data at the top of the report, based on real visitors, is the more reliable measure.
Can you speed up my existing website?
Usually, yes. We audit the site, fix images, scripts and hosting issues, and re-measure. Sometimes a rebuild is more cost-effective, and we'll tell you if so.
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