PageSpeed Insights Pro

Test any URL with the real Google PageSpeed Insights API. LCP, INP, CLS, FCP, TTFB on mobile + desktop. Top fixes ranked by impact.

About the tool

What is the SBMM PageSpeed Insights Pro?

PageSpeed Insights Pro is a free Core Web Vitals deep dive that runs the official Google PSI v5 API on any public URL and returns the same scores Search Console uses. You get the full LCP, INP, CLS, FCP, and TTFB picture on both mobile and desktop, plus an executive summary, a top-20 resource impact list, and a prioritised fix queue that orders recommendations by likely ranking gain.

Page speed is now both a confirmed Google ranking signal and a direct conversion lever. A one-second drop in LCP correlates with measurable lifts in organic clicks, e-commerce conversion, and ad-impression revenue. This tool is built to make those fixes obvious instead of buried in a sea of warnings.

Unlike raw PSI, this report layers an AI Optimization Advisor on top that reads the page stack (CMS, framework, hosting, CDN) and tells you exactly which lever to pull first. It also surfaces AI search readiness signals that ChatGPT and Perplexity use to decide which sources to cite. For a sitewide speed snapshot rather than a single-URL deep dive, run the Site Audit Pro which samples speed across the full crawl.

Step by step

How to use this tool in 3 steps

  1. Step 01

    Enter any public URL

    Drop the URL of any public page you want to test. The audit pulls fresh CrUX field data when traffic is high enough, and falls back to a throttled-mobile lab simulation otherwise. Both signals are surfaced clearly.

  2. Step 02

    We call the live Google PSI API

    The audit talks to the real Google PageSpeed Insights API v5 for both mobile and desktop, then layers executive grades, top-20 resource impact, and a fix priority engine on top of the raw response.

  3. Step 03

    Read the fix queue and ship

    See each recommendation ranked by likely impact, with stack-aware fix guidance (WordPress, Shopify, Next.js, Vercel, Cloudflare, and more), and a copy-ready dev brief for your engineer. Re-test after each fix to confirm the score moves.

Why this tool

Why use this tool

  • Real Google PSI v5 API

    Pulls live data from the official Google PageSpeed Insights API on both mobile and desktop, so the scores you see are identical to the ones Google Search Console uses for Page Experience ranking.

  • Core Web Vitals deep dive

    Full LCP, INP, CLS, FCP, and TTFB breakdown with the element / event / shift that caused each value, plus the threshold needed for a Good rating in the next Search Console rollover.

  • Top-20 resource impact

    A ranked list of the twenty resources slowing the page down most, with byte size, blocking time, render-blocking flag, and the fix recommendation per item so you know exactly which file to attack first.

  • Stack-aware fix priority engine

    Reads the page CMS, framework, hosting, and CDN, then orders recommendations by likely speed gain on that stack. The first three fixes are usually responsible for over half the achievable score lift.

  • AI Optimization Advisor

    Translates the raw PSI report into a plain-English brief: which CSS to defer, which images to convert to WebP, which third-party scripts to lazy-load, which CDN setting to flip. No guesswork, no jargon.

  • AI search readiness signals

    Flags the speed and structure signals ChatGPT, Claude, Gemini, and Perplexity look at when deciding which sources to cite. A fast page with clean structure is significantly more likely to win citations.

FAQ

Frequently asked questions

What is Core Web Vitals?

Core Web Vitals is a set of three Google ranking metrics that measure real-user page experience: Largest Contentful Paint (LCP) for loading speed, Interaction to Next Paint (INP) for responsiveness, and Cumulative Layout Shift (CLS) for visual stability. All three feed Page Experience signals in Google search.

Is this a real PageSpeed Insights API or a simulation?

This is the real Google PageSpeed Insights API v5, the same API that powers pagespeed.web.dev and the Page Experience signal in Search Console. Scores are identical to what Google sees.

What is the difference between field data and lab data?

Field data is what your real visitors actually experienced in the last 28 days, pulled from the Chrome User Experience Report (CrUX). Lab data is a single simulated test on a throttled mobile device. Both surface in the report so you know which numbers are observed and which are estimated.

Why is my mobile score so much lower than desktop?

Mobile PSI tests simulate a mid-tier Android device on a slow 4G connection, while desktop tests a fast wired connection. Image loading, JavaScript parse time, and font swapping all hit mobile harder, so a 30 to 40 point gap is normal. Optimise for mobile first because that is what ranks.

How often should I re-test after a fix?

For lab scores, re-test immediately. The lab number updates on every run. For field scores in Search Console, wait at least 28 days because the CrUX dataset uses a rolling 28-day window. Most teams test lab after each deploy and field at the start of each month.

What is INP and why does it matter more than FID?

INP (Interaction to Next Paint) measures how long the page takes to visually respond to any user interaction, not just the first one. Google replaced First Input Delay (FID) with INP in March 2024 because it is a more honest measure of perceived responsiveness across the whole session.

Does this tool replace lighthouse?

It uses the same Lighthouse engine under the hood (that is what PSI runs internally), but layers executive grades, top-20 resource ranking, AI Optimization Advisor, and AI search readiness signals on top. Use it instead of bare Lighthouse if you want the fixes ordered for ranking impact. For the broader on-page picture beyond pure speed, pair PageSpeed with our 122-check on-page audit on the same URL.