Methodsp75
Percentile (p75)
The value below which a given share of visits fall. p75 means 75 percent were at least this fast.
Averages hide pain: a handful of very slow sessions can be masked by many fast ones. Percentiles describe the distribution instead. The 75th percentile is the threshold Core Web Vitals use, so that three out of four visits are represented and the worst quarter cannot be averaged away.
Watching p75 (and p90 or p95 for the tail) shows what most people experience and how bad it gets for the unlucky, which an average never reveals.
Related terms
- RUMReal User MonitoringMeasuring performance from the browsers of your actual visitors, on their real devices and networks.
- Synthetic MonitoringScheduled, repeatable tests that load a page in a controlled environment on a fixed interval.
- Lab data vs field dataLab data comes from a controlled test; field data comes from real visitors. Both matter, for different reasons.
- LighthouseGoogle's open-source tool that audits a page in a lab run and scores performance, accessibility, SEO and more.
- CrUXChrome UX ReportGoogle's public dataset of real-world Core Web Vitals, aggregated from opted-in Chrome users.
- Web Vitals AttributionThe extra diagnostic data that explains why a metric was slow, not just how slow it was.
- Web AnalyticsTraffic and behaviour measurement: page views, visitors, referrers and journeys, alongside performance.
- Error TrackingCapturing JavaScript errors and failed requests from real sessions, grouped so you see the real problems.
- AlertingNotification rules that tell you when a metric breaches a threshold or degrades, before customers complain.
Monitoring that
belongs in the EU.
Read-only by default: no cookies*, no long-lived identifiers, no US provider in the data path. Live in about five minutes.
Light
€29/month
200,000 pageviews included.
Need debugging and all features? Standard from €99 for 1M pageviews. Enterprise on request. See all plans