The Ultimate Guide to Core Web Vitals for Business Owners

Google has made Core Web Vitals an explicit ranking signal. If you don't know what your site's scores are, you might already be losing organic traffic and not know it. Here's a plain-English guide for business owners.

What Core Web Vitals actually measure

Three numbers Google tracks for every page on your site:

• LCP (Largest Contentful Paint) — how fast the main content shows up. Target: under 2.5 seconds.
• INP (Interaction to Next Paint) — how fast the site responds when you tap or click. Target: under 200ms. (Replaced FID in 2024.)
• CLS (Cumulative Layout Shift) — how much the page jumps around as it loads. Target: under 0.1.

How to check your scores in 60 seconds

1. Open Google's PageSpeed Insights at pagespeed.web.dev.
2. Paste your homepage URL.
3. Look at the "Core Web Vitals Assessment" — green is good, orange is needs work, red is failing.

For deeper data, log into Google Search Console → "Core Web Vitals" report. This shows you scores from real visitors over the last 28 days, not just lab scores.

What "good" really takes

Hitting all three thresholds isn't trivial — about a third of websites fail at least one. The good news: most failures come from the same handful of issues.

• Bad LCP? Almost always: huge unoptimised images, slow hosting, or a heavy theme.
• Bad INP? Usually: heavy JavaScript on the main thread (especially third-party scripts).
• Bad CLS? Almost always: images without size attributes, late-loading ads, or web fonts swapping.

The business impact

Studies from Google's own data:

• Sites that pass Core Web Vitals saw 24% lower bounce rates.
• Pages with fast LCP convert 2.4× better than slow ones.
• Cumulative Layout Shift directly correlates with rage-clicking and abandonment.

What to ask your developer

Don't just ask "are we fast?" Ask:

• "What's our 75th percentile LCP, INP, and CLS in Search Console?"
• "What's the biggest single fix for each?"
• "Can we set up monitoring so we'll know when scores drop?"

If they can't answer those, that's a useful signal in itself.

Need a Core Web Vitals audit with a clear action plan? Get in touch.