Use PageSpeed Insights for the diagnostic. Use nimo when the next step has to be clear.
PageSpeed Insights is the right free place to check a page with Google's own lab and public field data. nimo is the better fit when someone needs the result explained as a source-labeled proof report with one owner, one first safe fix, and a handoff path.
nimo follows one workflow: Find the gap. Explain why. Fix or hand off. Watch the result.
Proof report preview
Source label, likely cause, first action.
PSI can show the problem. nimo turns it into the handoff.
If field data is slow but the lab run looks fine, the report keeps both labels visible and suggests what to inspect first.
CrUX label: public field data, previous 28-day window when available
Lighthouse label: point-in-time lab diagnostic
First action: reduce render-blocking work before changing the whole page
Owner: developer or CMS owner, depending on where the blocking resource lives
Choose nimo if
The answer has to become a first fix.
You need to explain why CrUX field data and Lighthouse lab data disagree.
You want the first safe fix, owner, and acceptance check in plain language.
You need a shareable proof report before asking a developer or CMS owner to act.
Choose PageSpeed Insights if
You need the fastest free diagnostic.
You want Google's free mobile and desktop diagnostic for a single page.
You need a quick Lighthouse report without creating an account.
You already know how to turn raw audits into a safe implementation plan.
Source labels
The comparison is only useful when field and lab data stay separate.
PageSpeed Insights can combine Lighthouse lab data with CrUX field data when field data is available. nimo keeps those labels visible so the next step is based on the right kind of evidence.
CrUX field data
Public Google field data from real Chrome usage when enough data is available.
It commonly reflects the previous 28-day collection period, so it is not same-day proof.
Lighthouse lab data
A controlled, point-in-time diagnostic run that helps debug a specific page.
It can disagree with field data because it is a test environment, not the whole audience.
Unavailable
The page or origin did not have enough public field data for the requested view.
Use lab diagnostics for the immediate next step, then rerun later if field data appears.
Workflow
nimo turns the PSI-style evidence into a cleaner handoff.
The goal is not to replace PageSpeed Insights for everyone. It is to reduce the translation work between a diagnostic report and the first practical change.
Find the gap
Compare the page against PSI-style source labels so the reader sees which facts came from CrUX, Lighthouse, or no available source.
Explain why
Translate the evidence into the most likely reason the page feels slower or needs more investigation.
Fix or hand off
Name the owner, the first safe action, and the acceptance check to rerun after the change.
Watch the result
Rerun Lighthouse after deploy, then wait for CrUX to catch up before treating the field gap as closed.
Tradeoffs
Be fair about where PSI is stronger.
PageSpeed Insights is hard to beat when the job is a quick free diagnostic from Google's ecosystem. nimo wins when the job is turning that evidence into a source-labeled explanation and a first action someone can review.
PSI is stronger for
Free mobile and desktop diagnostics, quick Lighthouse details, and direct visibility into the source labels Google provides.
nimo is stronger for
Explaining the disagreement, choosing a first safe fix, naming the owner, and creating a handoff from the proof report.
Sources checked
Competitor claims come from official PageSpeed and Chrome docs.
Checked on May 19, 2026. Recheck source labels before changing PSI capability copy or adding any API, quota, or new-feature claim.
FAQ
Common questions before you compare.
Is nimo a replacement for PageSpeed Insights?
No. PageSpeed Insights is still useful for quick free diagnostics. nimo is for turning the evidence into a clearer source-labeled report, first action, owner, and handoff.
Why can CrUX and Lighthouse disagree?
CrUX is public field data from real Chrome usage when enough data exists. Lighthouse is a point-in-time lab run, so the two sources can point at different parts of the problem.
Can this prove a fix worked the same day?
Use Lighthouse for an immediate rerun after deploy. Treat CrUX as delayed field evidence and wait for the field data window to catch up before calling the gap closed.
Run the comparison on your page.
Start with the PageSpeed Insights preset, replace the URLs with the pages that matter, and turn the result into a proof report with one first safe fix.
Run your own comparison