Core Web Vitals is one of those phrases that makes business owners glaze over. It sounds like developer jargon — and honestly, the underlying technology is — but the impact on your business is very real. These three metrics determine whether your website feels fast and stable to visitors, and Google uses them as part of its ranking signals. You do not need to understand the code behind them. You do need to know whether your site passes or fails — and what that means for enquiries.
LCP — Largest Contentful Paint
LCP measures how long it takes for the main content on your page to appear. Think of it as: how quickly does a visitor see something useful? If your homepage takes five seconds to show the hero image and headline, your LCP is poor. Google wants this under 2.5 seconds. Slow LCP means visitors bounce before your site even loads — and they call your competitor instead. On mobile connections, this problem is even worse.
What causes poor LCP?
- Oversized images that have not been compressed or resized
- Slow web hosting, especially cheap shared hosting
- Render-blocking scripts and stylesheets loading before content
- Heavy page builder platforms adding unnecessary code
INP — Interaction to Next Paint
INP replaced First Input Delay (FID) as a Core Web Vital in 2024. It measures how quickly your site responds when a visitor interacts with it — clicking a button, tapping a menu, filling in a form. If someone taps your contact button and nothing happens for a second, that is a bad INP. Google targets under 200 milliseconds. Unresponsive sites feel broken, even if they look fine. Menus that lag and forms that stutter are more common than most business owners realise.
CLS — Cumulative Layout Shift
CLS measures visual stability. Have you ever tried to tap a button on your phone and the page shifts at the last second because an advert or image loaded above it? That is layout shift, and it is infuriating. A good CLS score is below 0.1. High CLS frustrates users, causes misclicks, and signals to Google that your site offers a poor experience.
Why should a small business owner care?
Google has confirmed that page experience — including Core Web Vitals — influences search rankings. A slow, janky website ranks lower, converts fewer visitors, and damages your credibility. Check your scores with Google's free PageSpeed Insights tool, and fix anything in the red before spending on ads or content. Poor scores are fixable — but only if you know they exist.
Every site I build is optimised for performance from the start — compressed images, clean code, fast hosting, and no unnecessary bloat. I target green scores across all three Core Web Vitals because it matters for both Google rankings and real visitors.
You do not need to become a performance expert. Run your URL through PageSpeed Insights, note anything flagged red, and either fix it or ask your designer to. For most small business sites, the fixes are straightforward: smaller images, better hosting, and less bloated code. Those three changes alone can transform how your site feels to visitors.
Need a website?
I build affordable sites from £150. Book a call or check pricing.