Track Core Web Vitals for Sites

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The CrUX Dashboard provides visualisation of real user data sourced from Google’s Chrome User Experience Report (CrUX) API. CrUX provides this data without requiring the addition of any tracking scripts to your site or application, and is also used as a ranking signal for the Google Search algorithm. CrUX serves as a foundational alternative to setting up real user monitoring.

The CrUX Dashboard is automatically created for every Site tracked in Calibre. Reports are generated for a Site’s overall origin¹ data, along with individual reports for each Page tracked within a Site.

View your CrUX Dashboard

1. To view the CrUX Dashboard for your Site, go to Site → CrUX → Dashboard.
2. View the Site’s origin report, or select a specific Page from the Origin/Page Dropdown.
3. Filter by device type to find performance issues in specific environments.
4. Change chart type to analyse metric trends or check if majority of sessions have good performance.

The CrUX Dashboard shows real-user session data for the following Core Web Vitals and Web Vitals data:

• Largest Contentful Paint
• Cumulative Layout Shift
• Interaction to Next Paint
• First Contentful Paint
• Time to First Byte
• Round Trip Time

All metric values and bar charts are colour-coded based on their value and status, so you can easily assess where to focus:

• Green: Good
• Yellow: To improve
• Red: Poor

The dashboard also provides an overall Core Web Vitals assessment with the following options:

• failing: when at least one Core Web Vitals value is within the poor or to improve threshold.
• passing: when all Core Web Vitals values are within the good thresholds.
• not assessed: when a site cannot be assessed due to lack of data.

Switching between origin and Page reports

The Crux Dashboard defaults to displaying origin¹ report data, however reports can also be loaded for specific Pages tracked in Calibre via the Origin/Page Dropdown:

• Origin: This default option allows you to view aggregated CrUX data for an entire Site based on the Site’s Canonical URL¹, including pages that are not currently tracked in Calibre.
• Page: Individual reports are also available for all Pages tracked in Calibre, noting that each individual page is subject to CrUX's eligibility criteria.

Filter by device type

To explore how Core Web Vitals measurements change depending on the device used, choose a type from the following options:

• All (aggregate of all devices)
• Desktop
• Tablet
• Phone

It’s possible that data for a selected device is not available for a given site in the CrUX API. If the data is available, Calibre will display the percentage of contributing sessions for each device type when hovering over the filter element.

Change chart type

Depending on what your goal is, you can switch between two types of visual representation:

• 75th Percentile: a bar chart portraying how the P75 value for each Core Web Vital metric changed over time. This mode is useful for analysing trends.
• Experience Distribution: a stacked bar chart portraying the proportion of good, poor and needing improvement user experiences. This mode is useful in analysing if the majority of sessions happen without performance issues.
• Metric Subparts: a bar chart showing the individual timings that make up the Largest Contentful Paint metric, useful for understanding which part of LCP is causing delays.

Each bar in both types of charts represents a week of data collection period, and is updated weekly.