Real User Monitoring (RUM)
Real User Monitoring (RUM) measures performance and errors from the browsers of your actual visitors, capturing what real people experience.
RUM collects timing and error data from real sessions — load times, Core Web Vitals, and failures across the devices, networks, and locations your audience actually uses. It complements synthetic monitoring, which tests from controlled environments.
Because RUM reflects the real world, it is the best signal for prioritising performance work and spotting issues that only appear on specific devices, regions, or connection types.
Related terms
Synthetic MonitoringSynthetic monitoring proactively simulates user interactions against a service from controlled locations, rather than waiting for real users to hit a problem.Response TimeResponse time is how long a service takes to respond to a request, usually measured in milliseconds.TTFB (Time To First Byte)Time To First Byte (TTFB) is the time between making a request and receiving the first byte of the response.
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