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R
Performance

Real User Monitoring

Real user monitoring captures performance and error data from actual visits across real devices and network conditions.

Real User Monitoring shows how a website performs for actual users across different devices, browsers, locations, and network conditions. It can reveal loading issues, interaction delays, and technical errors that controlled lab tests may not capture. The most useful performance analysis combines these field measurements with repeatable lab tests and clearly defined performance targets. The concept is closely related to Core Web Vitals and Lighthouse.

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Core Web Vitals

Lighthouse

Monitoring

Web Analytics

FAQ

Real User Monitoring

What needs attention regarding data protection in real user monitoring?
RUM collects technical data such as device, browser, and load times, sometimes with IP addresses or identifiers. Whether consent is required depends on the vendor and the configuration. Data-minimal collection without user profiles simplifies matters. The legal assessment belongs in coordination with data protection, not in engineering alone.
When does dedicated real user monitoring beat public reports?
For low-traffic pages, public field data often provides no values, and dedicated collection closes that gap. RUM is also worthwhile when causes within segments such as country, device type, or page type need analysis. For smaller sites with sufficient traffic, freely available field data reports are often enough.
Why do field data and lab values differ?
Lab tests run under controlled conditions, real visits do not. Device power, network quality, cache state, location, and user behavior such as scrolling or clicking all change the measurements. INP also only becomes meaningful with real interaction. That is why Core Web Vitals are assessed on field data, at the 75th percentile.
How do real user monitoring and Lighthouse differ?
Lighthouse is a lab test: a reproducible measurement under fixed conditions on a simulated device. Real user monitoring captures field data from actual visits with real hardware and real networks. Lighthouse suits comparisons and debugging, RUM answers how users actually experience the page. The two complement each other.