PSI Opportunities
PSI Opportunities is your prioritised performance backlog. It rolls up every Lighthouse audit that was flagged as an "opportunity" — i.e. a fix that has measurable estimated savings in load time or bytes — across all the URLs we test, and ranks them by total impact so you know where to spend engineering time first.
What it contains
For each Lighthouse audit (e.g. Reduce unused JavaScript, Eliminate render-blocking resources, Properly size images) we aggregate across your latest PSI runs:
- URLs affected — how many of your tracked URLs trigger this opportunity.
- Total estimated savings (ms) — sum of
overallSavingsMsacross URLs. - Total estimated savings (KiB) — sum of
overallSavingsBytesacross URLs. - Worst URL — the URL with the largest single-page savings, so you have a concrete starting point.
How to read it
- Sort by Total savings (ms) to find the audits that move LCP / TBT the most.
- Sort by URLs affected to find platform-level fixes (a single template change often clears the same audit across dozens of pages).
- Click into the Worst URL directly on pagespeed.web.dev to see the per-resource breakdown Lighthouse provides.
Notes
- We use the latest PSI run per (URL, strategy) — runs older than that are not aggregated.
- An opportunity is included only if it currently fails (
score < 1) AND has non-zero estimated savings. - Score categories from Lighthouse are colour-coded the same way Google does: good, needs improvement, poor.