Core Web Vitals Tracking - Monitor LCP, INP & CLS

Q: Where does the Core Web Vitals data come from?

GSC Wizard reads the Chrome UX Report (CrUX) History API - the same anonymized field dataset from real Chrome users that powers the Core Web Vitals report in Google Search Console and PageSpeed Insights. Every value is the 75th percentile (p75), so a 'Good' rating means at least 75% of real visits met the target.

How it works

Three steps from a connected property to page experience you can actually act on.

1

Pick a Property or URL

Choose origin scope for the whole site or URL scope for a single page. GSC Wizard fetches its field data from the Chrome UX Report, auto-handling www vs non-www.

2

See Field Data Over Time

LCP, INP, and CLS plus supporting FCP and TTFB, each with a p75 trend and good / needs improvement / poor distribution across up to 40 weekly periods.

3

Get Alerted on Regressions

Turn on weekly monitoring and get an email the moment a Core Web Vital slips a rating bucket week over week, before it starts costing you rankings.

Page experience data you can trust and act on

Core Web Vitals are a Google ranking signal. GSC Wizard shows the real numbers Google measures, so you know exactly where you stand.

Real users, not lab scores

Field data from real Chrome visitors over a rolling 28-day window: the same Chrome UX Report source Google uses for page experience. No synthetic Lighthouse runs that miss what people actually feel.

Device-level breakdown

Compare phone, desktop, and tablet, or all devices combined, in one summary table. Mobile often tells a very different story: this is where you catch it.

Weekly regression alerts

Get emailed when LCP, INP, or CLS drops from Good to Needs improvement or Poor. Add up to five extra recipients and set custom good / poor thresholds per property.

Metrics & thresholds

The five metrics that shape page experience

Every value is the 75th percentile of real visits, rated against Google's official thresholds. The three Core Web Vitals drive the ranking signal; FCP and TTFB help you diagnose why a vital is slipping.

LCP - Largest Contentful Paint, loading. Good ≤ 2.5s, Poor ≥ 4.0s
INP - Interaction to Next Paint, responsiveness. Good ≤ 200ms, Poor ≥ 500ms
CLS - Cumulative Layout Shift, visual stability. Good ≤ 0.10, Poor ≥ 0.25
FCP - First Contentful Paint, supporting. Good ≤ 1.8s, Poor ≥ 3.0s
TTFB - Time to First Byte, supporting. Good ≤ 800ms, Poor ≥ 1.8s

New to page experience? Read our guide on Core Web Vitals in Google Search Console.

Latest p75 · all devices

LCP Largest Contentful Paint

1.28 sGood

INP Interaction to Next Paint

93 msGood

CLS Cumulative Layout Shift

0.000Good

FCP First Contentful Paint *

1.00 sGood

TTFB Time to First Byte *

455 msGood

Good Needs improvement Poor * Supporting metric

Frequently asked questions

What are Core Web Vitals?

Core Web Vitals are Google's three field metrics for real-world page experience: Largest Contentful Paint (LCP) for loading, Interaction to Next Paint (INP) for responsiveness, and Cumulative Layout Shift (CLS) for visual stability. They are part of Google's page experience signals. GSC Wizard also tracks two supporting metrics: First Contentful Paint (FCP) and Time to First Byte (TTFB).

Where does the Core Web Vitals data come from?

GSC Wizard reads the Chrome UX Report (CrUX) History API: the same anonymized field dataset from real Chrome users that powers the Core Web Vitals report in Google Search Console and PageSpeed Insights. Every value is the 75th percentile (p75), so a "Good" rating means at least 75% of real visits met the target.

How is this different from a Lighthouse score?

Lab data (Lighthouse, the PageSpeed score) is a single synthetic test on one simulated device. Field data is measured from real users over a rolling 28-day window and is what Google actually uses for page experience. GSC Wizard shows field data, so what you see reflects what real visitors experience, and what Google evaluates.

How far back can I see the history?

Up to 40 weekly collection periods, roughly nine months of history. Each metric is charted over time alongside its good / needs improvement / poor distribution so you can see exactly when a change happened.

How do the weekly alerts work?

Turn on monitoring for a property and device, and each week GSC Wizard checks whether LCP, INP, or CLS dropped from one rating bucket to a worse one week over week (for example Good to Needs improvement). If it did, you get an email, plus up to five extra recipients. You can set custom good and poor thresholds per property. Weekly alerts run on your own free Chrome UX Report API key.

Can I track a single page or the whole site?

Both. Origin scope reports Core Web Vitals for the whole site, while URL scope reports a specific page. GSC Wizard automatically falls back between the www and non-www host when only one has enough field data.

Start tracking Core Web Vitals today

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Track Core Web Vitals the way Google sees them

Every Core Web Vital, on one screen