PageSpeed Insights API – Website Speed Test & Core Web Vitals

Run Google PageSpeed Insights on a list of pages and get one clean row per page: the four Lighthouse scores (performance, accessibility, best practices, SEO), lab speed metrics (LCP, FCP, TBT, CLS, Speed Index), real-user Chrome data (LCP, INP, CLS) with a Core Web Vitals pass/fail, and the biggest slow-downs with the time each one costs. Mobile, desktop or both. Built for SEO audits, agencies reporting on client sites, developers checking releases and anyone tracking site speed over time. A bulk PageSpeed Insights tool: no Google API key or quota of your own needed.

What you get

• Lighthouse scores 0-100: performance_score, accessibility_score, best_practices_score, seo_score.
• Lab metrics from a fresh Lighthouse test: lcp_ms, fcp_ms, tbt_ms, cls, speed_index_ms, tti_ms, server_response_ms.
• Real-user field data from the Chrome UX Report (last 28 days): field_lcp_ms, field_inp_ms, field_cls, field_fcp_ms, field_ttfb_ms, each with a FAST / AVERAGE / SLOW rating. When a page has too little traffic, the whole site's data is used (field_data_source: "origin"); when the site has too little traffic too, it is null.
• passes_core_web_vitals: true when real users get LCP ≤ 2.5 s, INP ≤ 200 ms and CLS ≤ 0.1.
• top_issues: the five biggest slow-downs (unused JavaScript, render-blocking requests, image delivery, ...) with estimated savings in milliseconds.

Example output

{
  "url": "https://www.fender.com/",
  "final_url": "https://www.fender.com/",
  "device": "mobile",
  "performance_score": 32,
  "accessibility_score": 100,
  "best_practices_score": 73,
  "seo_score": 85,
  "lcp_ms": 17808,
  "fcp_ms": 2605,
  "tbt_ms": 3620,
  "cls": 0.011,
  "speed_index_ms": 11878,
  "tti_ms": 28813,
  "server_response_ms": 11,
  "field_data_source": "url",
  "field_lcp_ms": 3472,
  "field_lcp_rating": "AVERAGE",
  "field_inp_ms": 265,
  "field_inp_rating": "AVERAGE",
  "field_cls": 0.03,
  "field_cls_rating": "FAST",
  "field_fcp_ms": 1565,
  "field_fcp_rating": "FAST",
  "field_ttfb_ms": 671,
  "field_ttfb_rating": "FAST",
  "passes_core_web_vitals": false,
  "top_issues": [
    { "id": "unused-javascript", "title": "Reduce unused JavaScript", "savings_ms": 4500 },
    { "id": "mainthread-work-breakdown", "title": "Minimize main-thread work", "savings_ms": 3600 },
    { "id": "bootup-time", "title": "Reduce JavaScript execution time", "savings_ms": 3350 }
  ],
  "lighthouse_version": "13.6.0",
  "checked_at": "2026-10-30T10:52:00+00:00"
}

Input

Field	What it does
urls	Pages to test, e.g. https://example.com/ or example.com/pricing. Up to 1,000 per run.
device	mobile (default, what Google ranks on), desktop, or both (two rows per page).

Pricing

Pay per event, no subscription:

• $5 per 1,000 tests ($0.005 per page per device). A page that cannot be tested (DNS error, site down) is free and comes back as an error row.
• $0.001 per run start.

Examples: 100 pages on mobile cost $0.501. 100 pages on mobile and desktop cost $1.001. Cap the cost of a run with the maximum charge setting; the Actor never starts a test the budget cannot pay for. On the free Apify plan a run does up to 5 tests (5 pages on one device); any paid plan lifts the limit.

Good to know

• Each test is a real Lighthouse run by Google and takes 10 to 90 seconds; up to 8 pages are tested at the same time.
• Lab scores move a few points between runs, as they do on pagespeed.web.dev; the real-user field data is steadier.
• Runs from the API, n8n/Make/Zapier, AI agents through MCP (rowfeed-seo-mcp) or on a schedule to track speed over time.

More SEO tools from Rowfeed

• SEO Audit Tool & Website Crawler – titles, meta descriptions, H1, noindex, broken links and a 0-100 SEO score for every page.
• Broken Link Checker – 404s, dead links, broken images and redirect chains on any website.
• Sitemap URL Extractor – every URL in a site's sitemaps, to feed into this test.
• Keyword Research Tool – search volume, CPC, keyword difficulty, intent and keyword ideas (Google & Bing).
• Competitor Keyword Research – every Google keyword any website ranks for, with position, volume and traffic.
• SERP API & Rank Checker – Google results for any keyword and country, with your domain's position.
• Backlinks Checker – referring domains, anchors, dofollow and link strength of any site.
• Website Traffic & Domain Authority Checker – traffic estimate and authority for up to 10,000 domains.
• AI Search Visibility Tracker – is your brand named and cited by ChatGPT, Gemini, Perplexity and Google AI Mode.
• WHOIS Lookup & Domain Checker – domain age, expiry, registrar and DNS in bulk.
• DA PA Checker – domain authority, page authority and spam score for up to 10,000 domains or URLs.

Uses Google's official PageSpeed Insights API. Not affiliated with Google.