Chrome UX Report

Data & Tracking

Also: CrUX · Chrome User Experience Report

What it isReal Chrome user speed data

Used forRanking via Core Web Vitals

Update cycle28-day rolling average

Not the same asYour lab speed test

Quick definition

Chrome UX Report (CrUX) is Google's public dataset of real-world page performance, collected anonymously from actual Chrome users who opt in. It's the source Google uses for Core Web Vitals ranking signals, as opposed to lab tests run on a single machine under test conditions.

What it actually means

Think of a lab speed test like a car being tested on a closed track. Controlled conditions, no traffic, ideal weather. Chrome UX Report is the same car being driven by thousands of ordinary people on ordinary roads, in traffic, in the rain, on a phone with three other tabs open.

Google collects this field data from Chrome users who've opted in to share usage statistics. It aggregates loading speed, responsiveness and layout stability across real sessions on your site, then publishes it as a dataset. Tools like PageSpeed Insights and Search Console pull from this dataset to show you the 'field data' version of your Core Web Vitals scores, sitting alongside the 'lab data' from a single simulated run.

The distinction matters because CrUX is what actually feeds into search rankings. A page can score perfectly in a lab test on a fast office connection and still fail in CrUX because most of your real visitors are on patchy mobile data. Attribution of ranking impact often gets confused here too. It's not your PageSpeed score that ranks you. It's the CrUX data behind it.

Your lab test tells you what could happen. CrUX tells you what actually happened to real people on real connections.

How it shows up

CrUX shows up as the 'field data' section in Google's PageSpeed Insights report and in the Core Web Vitals report inside Search Console. If a URL doesn't have enough real Chrome traffic, Google won't show CrUX data for it at all and will fall back to origin-level aggregates or lab-only figures. Low-traffic pages often have no CrUX data, which is itself a signal worth noticing.

The Australian context

Australian sites hosted on servers or content delivery networks based overseas often show a wider gap between their lab scores and their CrUX field data than sites hosted closer to Australian visitors. The lab test doesn't account for the extra distance the data has to travel. If your CrUX numbers are consistently worse than your lab numbers and your audience is mostly Australian, hosting location is the first thing to check.

Where people get this wrong

Reporting the lab score as the real Core Web Vitals result.Rankings are driven by the CrUX field data, not the single-run lab test. A great lab score with poor field data still fails.

Expecting instant results after a fix ships.CrUX is a 28-day rolling average of real sessions. A shipped fix takes weeks to fully replace the older, slower sessions in the dataset.

Assuming every page has CrUX data available.Low-traffic URLs often lack enough real Chrome sessions to generate a field data score. No data isn't a pass, it's an unknown.

Common questions

Is Chrome UX Report the same as Google Analytics?

No. Google Analytics tracks visitor behaviour on your specific site through a tracking script you install. Chrome UX Report is a separate anonymous dataset of performance metrics collected from Chrome users across the web, with no tracking script required on your end.

Why doesn't my page show any CrUX data?

CrUX only reports on pages with enough real Chrome traffic to form a reliable sample. Low-traffic pages often show no field data at all. Google will sometimes fall back to origin-level data covering your whole site instead.

Can I access raw Chrome UX Report data myself?

Yes. Google publishes it as a public dataset queryable through BigQuery, and also offers a simpler CrUX API for pulling scores on specific URLs. Most teams never need to go past PageSpeed Insights or Search Console though.

Does CrUX data affect my rankings directly?

Yes, indirectly. It's the field data source behind Core Web Vitals, which Google uses as a ranking signal. A weak CrUX result on loading speed, responsiveness or layout stability can hold back an otherwise strong page.

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About New Rebellion

New Rebellion is a marketing intelligence consultancy. We build tools, score Australian businesses on how their marketing actually performs, and publish Debrief every day. This dictionary is part of how we work in the open.

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