Web Vitals

Web Vitals are modern user-centric metrics developed by Google that measure a user's experience loading a webpage. These measurements assess how quickly a web page's content loads, how quickly a browser responds to a user's input, and how stable the content loads in the browser. These factors will be taken into account when Google ranks your web pages for mobile devices.

Currently, Site24x7 RUM measures six web vitals.

  1. Cumulative Layout Shift- This score is used to determine the "visual stability" of a page. The lower the CLS score, the better the visual stability.
  2. First Input Delay- This score is used to measure the time between when a user interacts with your site for the first time (i.e. when they click a link, tap a button, or press a key) and when the browser can reply to that interaction.
  3. Largest Contentful Paint- It measures the time from when the page starts loading to when the largest text block or image element is rendered on the screen.
  4. First Contentful Paint- It measures the time from when the page starts loading to when any part of the page's content is rendered on the screen.
  5. Interaction to Next Paint- It measures a page's overall responsiveness to user interactions by assessing the latency of all click, tap, and keyboard engagements that occur during the course of a user's visit to a page. The final INP value is the longest interaction recorded after excluding outliers.
  6. Time to First Byte- It measures the time between when a resource request is made and when the first byte of response begins to arrive.

The Web Vitals Thresholds to Categorize the Performance

 GoodNeeds ImprovementPoor
Cumulative Layout Shift Less than 0.1 0.1 to 0.25 More than 0.25
First Input Delay Less than 100 ms 100 ms to 300 ms More than 300 ms
Largest Contentful Paint Less than 2500 ms 2500 ms to 4000 ms More than 4000 ms
First Contentful Paint Less than 1800 ms 1800 ms to 3000 ms More than 3000 ms
Interaction to Next Paint 200 ms and below 200 ms to 500 ms More than 500 ms
Time to First Byte Less than 800 ms 800 ms to 1800 ms More than 1800 ms

To View the Web Vitals Metrics

Log in to your Site24x7 account > RUM > Your application > Web Vitals.

Web Vitals Tab

Under Metrics Summary, you'll get a summary of all the six web vitals, such as minimum value, average value, maximum value, 1st percentile, 5th percentile, 50th percentile, and so on.

Under Web Vitals Breakdown, you'll get a graphical representation of the web vital metrics.

Web Vitals navigation
Figure 1: Overview of Web Vitals.

Under Web Vitals Report, you'll get the web vitals reports for Web Pages, Devices, Browser, Users, Domains, Connection Types, Top Viewports, and Device Memory.

Web vitals report
Figure 2: Web Vitals Report.

Individual data can also be added as filters by clicking on them.

Largest Contentful Paint Tab

You can view the split-up of the Good, Needs Improvement, and Poor web pages, as well as the list of affected elements' count and score. Below is the histogram distribution representation marking the 75th percentile, which Google considers to be the standard score. The Web Vitals Report is also available at the bottom of the page.

Figure 3: Overview of Largest Contentful Paint Tab.

Similarly, you can view the details of other metrics in their respective tabs.

To Filter and Analyze the Web Vitals Data

You can analyze your website performance by filtering it based on various parameters, including pages, browsers, devices, connection types, users, domains, metric types, and so on.

Figure 4: Filtering the Web Vitals Data.

To View the Web Vitals Data in the Web Pages

 Log in to your Site24x7 account > RUM > Your application > Web Pages. Click the required transaction to get the split-up and histogram distribution of all the web vitals.

Figure 5: Web Vitals Data in the Web Pages.

The web vitals data are also available in the dashboard and reports.
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