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PageSpeed Insights

In short

PageSpeed Insights combines real-user field data, when available, with Lighthouse diagnostics to investigate performance, not certify it.

PageSpeed Insights reports field data from real users when available and controlled Lighthouse lab diagnostics. Neither is a promise about every visitor, and missing field data is not a passing result.

The diagram shows the main inputs, checks and decision path for PageSpeed Insights.

Practical implementation

Run the canonical URL on mobile and desktop, separate field observations from lab opportunities, and investigate the largest failing layer before editing. Slow server response, render-blocking assets and layout shifts need different fixes. Make one bounded change, retain a before state, then repeat after deployment.

What to verify

Record test mode, URL, device profile, time and data availability. Inspect the rendered page for the user-facing change and monitor field data over an appropriate period. Keep partial or unavailable data labelled.

Common mistakes

Do not chase a single score or claim real-user improvement from one lab run. Scores can change with test conditions.

FAQ

PageSpeed Insights reports field data from real users when available and controlled Lighthouse lab diagnostics. Neither is a promise about every visitor, and missing field data is not a passing result.
Record test mode, URL, device profile, time and data availability. Inspect the rendered page for the user-facing change and monitor field data over an appropriate period. Keep partial or unavailable data labelled.