real-user monitoring
Real user monitoring, or RUM, measures performance from the browsers of your actual visitors as they use a live site, rather than from a lab test like Lighthouse that simulates one controlled device. It collects timings straight from the browser, recording things like Largest Contentful Paint and Interaction to Next Paint across real devices, real connections, and real locations. Google’s Chrome User Experience Report is the most widely used RUM dataset, and it feeds the field-data sections of PageSpeed Insights and the Core Web Vitals that affect ranking. Commercial tools like Datadog, New Relic, and SpeedCurve add custom dashboards, real-time alerts, and breakdowns by location, device, and browser that Google’s monthly snapshots can’t give you.
Also known as: RUM, field data, real user data, CrUX, Real User Monitoring
Where this term comes up
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Will my Lighthouse score hit 100?
Probably not, and chasing 100 is a bad goal. The right goal is field Core Web Vitals in the green for the templates that actually drive revenue. Lighthouse is a lab tool; CrUX is what Google ranks on.
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Can you guarantee a specific Lighthouse score?
No, and any agency that does is selling you a number, not an outcome. The goal is field Core Web Vitals in the green for the templates that drive revenue. Lighthouse is a lab tool; CrUX is what Google ranks on. The after-report shows the numbers honestly, whichever way they moved.
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Glossary entries are a starting point. The real question is usually what to do about the thing once you understand it.
When you are ready to go further, the related guides take this from definition to fix.
And if you would rather just ask a person, I read everything that comes to christopher@thisismyurl.com.
I have been working in WordPress since 2007, so most of these terms come with a story.
Still mapping the basics? The full glossary is here whenever you need it.