Lighthouse / PageSpeed Insights

Core Web Vitals and speed audit

FreeSEO, growth & newsletterpagespeed.web.dev

What it is

PageSpeed Insights runs Google's open-source Lighthouse audit against a URL and scores performance, accessibility, best practices and SEO alongside lab Core Web Vitals. It also surfaces real-user CrUX field data — LCP, INP and CLS from actual Chrome visitors — when a URL has enough traffic.

Why it earns a slot

Core Web Vitals are both a ranking input and a real bounce factor on image-heavy article pages. Lighthouse CI can fail a build when a page regresses, so performance stops rotting silently.

Know before you commit

Lab scores swing between runs and reward synthetic conditions — trust the CrUX field data over the headline score. A new site has no field data at all for months.

Getting started

npx lighthouse https://example.com --view

Field notes

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Field check

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Pricing snapshot

Free. Web UI is unlimited; the PageSpeed Insights API allows 25,000 requests/day at no cost. Lighthouse is open source under Apache 2.0 and runs in Chrome DevTools, the CLI or CI.

Snapshots move fast — verify at checkout, and post a field note if it changed.

Drop into your Lovable chat

Evaluate Lighthouse / PageSpeed Insights (https://pagespeed.web.dev) for this project, then use it only if it fits what we are already building.
Context: Core Web Vitals and speed audit. PageSpeed Insights runs Google's open-source Lighthouse audit against a URL and scores performance, accessibility, best practices and SEO alongside lab Core Web Vitals. It also surfaces real-user CrUX field data — LCP, INP and CLS from actual Chrome visitors — when a URL has enough traffic.
Reviewer notes (general, not written for this codebase): Core Web Vitals are both a ranking input and a real bounce factor on image-heavy article pages. Lighthouse CI can fail a build when a page regresses, so performance stops rotting silently.
Watch out for: Lab scores swing between runs and reward synthetic conditions — trust the CrUX field data over the headline score. A new site has no field data at all for months.
Pricing: Free. Web UI is unlimited; the PageSpeed Insights API allows 25,000 requests/day at no cost. Lighthouse is open source under Apache 2.0 and runs in Chrome DevTools, the CLI or CI.
Setup: npx lighthouse https://example.com --view
Rules: treat the notes above as background only. Do not assume a theme, style, layout or feature that is not already in this project — inspect the existing code first and ask me before changing visual direction.

/api/public/tools/lighthouse-pagespeed-insights

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