PageSpeed History
PSI History is the chronological log of every PageSpeed Insights run we captured for your tracked URLs, sorted newest first. It's how you reconstruct the timeline of speed improvements, regressions and platform-level changes — and how you tie a particular score movement to a particular release or content change.
What it contains
- URL — which page was measured.
- Capture date — when the run executed.
- Device — mobile or desktop.
- Performance score — the headline 0–100 Lighthouse number.
- LCP / CLS / INP / FCP — the underlying metric values from that run.
How it's produced
Each tracked URL is sent through the PageSpeed Insights API on a recurring schedule (typically daily or weekly, configurable). Each run is recorded with its timestamp and metric values; this report is the full history.
When to use it
- Investigating a sudden score drop — pinpoint the run-to-run boundary and align with your deployment log.
- Showing stakeholders that an optimisation effort actually moved the needle, with dated evidence.
- Quantifying noise — successive runs typically vary 5–10 points; this report makes that variability concrete so you don't over-react to a single reading.
Caveats & limits
- Lab metrics fluctuate run-to-run. Treat clusters of consecutive runs as the truth, not a single data point.
- Google occasionally adjusts Lighthouse weighting (the way the 0–100 score is composed); a platform change can cause an apparent score shift across all URLs at once.
Related reports
- PSI Overview — latest run only, all URLs.
- Core Web Vitals Distribution — field data, the ranking-relevant view.