Core Tech
PMC Plugins
Pmc Performance Metrics

pmc-performance-metrics

Record performance metrics, such as Google's Web Vitals, via existing analytics integrations.

Usage

On a site that loads Google Analytics or Google Tag Manager, enable the pmc-performance-metrics plugin. As long as either GA or GTM is loaded using PMC's corresponding plugin, this plugin will automatically report metrics.

If the site uses a custom analytics integration, the \PMC\Performance_Metrics\Web_Vitals::FILTER_TAG_PROVIDER constant provides access to a filter tag that should be used to set the analytics provider to either ga or gtag.

In non-production environments, if an analytics provider isn't present, metrics are logged to the console.

Data

Once enabled, Google Analytics will record "Web Vitals (opens in a new tab)" events capturing the following:

  • CLS: Cumulative Layout Shift (Chromium)
  • FCP: First Contentful Paint (Chromium)
  • FID: First Input Delay (Chromium, Firefox, Safari)
  • LCP: Largest Contentful Paint (Chromium)
  • TTFB: Time to first byte (Chromium, Firefox, Safari, Internet Explorer)
  • TTFB-RT: Time to first btye, less time spent on DNS lookup, connection negotiation, network latency, and unloading the previous document (Chromium, Firefox, Safari, Internet Explorer)
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