Provides a framework for leveraging real user metrics to detect optimizations for improving page performance.

vikinguard

Vikinguard

With Vikinguard you'll know the real user experience of your site and you'll be notified when something is not performing as expected.

Pingdom

Real User Monitoring by Pingdom

With SolarWinds® Pingdom® real user monitoring you'll see how your website performs, how your users experience it, and what slows it down.

Pierre Lannoy

Hosterra

Vibes

Truthful user experience and browsing performances monitoring.

Site24x7

Site24x7 Real User Monitoring

Real User Monitoring (RUM) by Site24x7 provides deep and accurate insight into real users’experience on your WordPress setup.

SpeedVitals

SpeedVitals RUM

Integrates SpeedVitals RUM Script in your WordPress Website

akamai

mPulse Real User Measurement

How fast do your users think your site is, really?  How fast should it be?  How do you get there?

rapidspike

Real User Monitoring by RapidSpike

Live performance data via Real User Monitoring. Track real user experience - traffic volume and page load speed - by country, browser and device.

pagevitals

PageVitals

Integrates PageVitals Field Testing (RUM) into your WordPress site.

Prakhar Bhatia

Core Web Vitals – Real User Monitoring (RUM)

Track Core Web Vitals (LCP, INP, CLS, FCP, TTFB) from real users with comprehensive analytics, GA4 integration, and performance insights.

watchlog

Watchlog RUM

Real User Monitoring (RUM) for WordPress powered by Watchlog.

MUDRAVA

MUDRAVA RUM

Real User Monitoring (RUM) plugin for WordPress that tracks TTFB, LCP, server generation time, and other performance metrics from real visitors.

WordPress.org

This plugin captures real user metrics about what elements are displayed on the page across a variety of device form factors (e.g. desktop, tablet, and phone) in order to apply loading optimizations which are not possible with WordPress’s current server-side heuristics.
This plugin is a framework dependency which does not provide optimization functionality on its own. For that, please install the <a href="https://wordpress.org/plugins/image-prioritizer/" rel="ugc">Image Prioritizer</a> and <a href="https://wordpress.org/plugins/embed-optimizer/" rel="ugc">Embed Optimizer</a> dependent plugins (among <a href="https://github.com/WordPress/performance/labels/%5BPlugin%5D%20Optimization%20Detective" rel="nofollow ugc">others</a> to come from the WordPress Core Performance team). There are currently no settings and no user interface for this plugin since it is designed to work without any configuration.
Your site must currently have the REST API accessible to unauthenticated frontend visitors since this is how real user metrics are collected about pages on your site; nevertheless, <a href="https://github.com/WordPress/performance/issues/1311" rel="nofollow ugc">exploration</a> is underway for providing alternative mechanisms for collecting the metrics. Also, please note that no metrics are currently collected from Safari since it does not yet support the <a href="https://developer.mozilla.org/en-US/docs/Web/API/LargestContentfulPaint" rel="nofollow ugc">Largest Contentful Paint</a> metric, but support for this <a href="https://web.dev/explore/learn-core-web-vitals" rel="nofollow ugc">Core Web Vitals</a> metric is coming this year <a href="https://webkit.org/blog/16458/announcing-interop-2025/#core-web-vitals" rel="nofollow ugc">via Interop 2025</a>.
Please refer to the <a href="https://github.com/WordPress/performance/blob/trunk/plugins/optimization-detective/docs/README.md" rel="nofollow ugc">full plugin documentation</a> for a <a href="https://github.com/WordPress/performance/blob/trunk/plugins/optimization-detective/docs/introduction.md" rel="nofollow ugc">technical introduction</a>, <a href="https://github.com/WordPress/performance/blob/trunk/plugins/optimization-detective/docs/hooks.md" rel="nofollow ugc">filter/action hooks</a>, and <a href="https://github.com/WordPress/performance/blob/trunk/plugins/optimization-detective/docs/extensions.md" rel="nofollow ugc">extensions</a> that show use cases and examples. You can also watch the talk from WordCamp Asia 2025: <a href="https://weston.ruter.net/2025/02/21/boosting-performance-with-optimization-detective/" rel="nofollow ugc">Boosting Performance with Optimization Detective</a>.

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