Core Web Vitals are three measurements of how a page feels: how soon the main content shows, how soon a tap does something, and whether the layout jumps while you read. Google uses them in Search as page-experience signals. You do not need to become a performance engineer to use the report.

Last reviewed: September 2026. Thresholds below are the ones Google has published on web.dev for a “good” experience. Recheck that table if you are quoting a client. Why they matter: speed and SEO.

Quick answer

LCP: shrink or postpone the big hero. INP: fewer heavy scripts on tap. CLS: give images width and height, stop injecting banners above content. Measure a real URL on page speed test.

Three Core Web Vitals: paint, tap response and layout shift
Appear, respond, stay still. That is the whole set.
Vital In one line Usual culprit
LCP When the main block appears Huge image, slow host, late CSS
INP How long after a tap until the page reacts Chat widgets, sliders, fat JavaScript
CLS How much things move Images without size, ads, webfonts

Field versus lab

Search Console shows field data when enough users hit the URL. A lab run (PageSpeed Insights, our tool) is for debugging. Do not celebrate a lab 95 if field LCP is still poor on cheap Androids in India.

What to do this week

Open the worst template. If LCP is an image, follow optimize images. If INP is a widget, remove it from the homepage. WordPress steps: speed up WordPress. Shopify: Shopify speed checklist.

Search Console says “poor” and you do not know which file?

Send the URL. Contact.