Page speed and Core Web Vitals for SEO

Measured on a schedule, not on a hunch.

Which Core Web Vitals does Google actually assess?

Largest Contentful Paint, Interaction to Next Paint and Cumulative Layout Shift, judged on real-user field data rather than on a lab run.

What is the difference between lab and field data?

Lab data comes from a controlled test run, which makes it reproducible and useful for debugging. Field data is aggregated from real Chrome users over the trailing 28 days, and it is what the Core Web Vitals assessment uses.

How often should I test?

On a schedule rather than ad hoc. The value is in the series: a single score cannot show a regression, and a regression is the thing you need to catch.

Can I monitor many pages at once?

Yes. URLs can be imported from your sitemap so a whole section is covered without adding pages by hand.

What is a performance budget?

A threshold you set per metric. When a page crosses it the check reports a failure, which turns performance from something you check into something that tells you.

Can I show a client the result?

Yes. Reports can be exported as PDF and branded, which is usually easier to hand over than a dashboard login.