Lighthouse & PageSpeed Bulk Auditor: Core Web Vitals

Run Google Lighthouse on a whole list of URLs and get one clean row per page. The same lab test that powers PageSpeed Insights, without an API key, without the PageSpeed quota, and without pasting URLs one at a time:

• Scores (0-100): performance, accessibility, best practices, SEO
• Core Web Vitals (lab): Largest Contentful Paint, Cumulative Layout Shift, Total Blocking Time, plus First Contentful Paint, Speed Index, Time to Interactive and server response time
• Page weight: total bytes, number of requests, DOM size, third-party domains
• What to fix: the top performance opportunities ranked by estimated time saved, and every failed accessibility, SEO and best-practices check
• Mobile and desktop in one run, with the full Lighthouse HTML report saved if you want it

Schedule it weekly to track site speed over time, audit every page of a site before a launch, or compare your pages with competitors'.

What you get

url, finalUrl, device, performanceScore, accessibilityScore, bestPracticesScore, seoScore, largestContentfulPaintMs, cumulativeLayoutShift, totalBlockingTimeMs, firstContentfulPaintMs, speedIndexMs, timeToInteractiveMs, serverResponseTimeMs, coreWebVitalsLabPass, pageWeightBytes, requestCount, domElements, thirdPartyDomains, opportunities, failedAccessibilityAudits, failedSeoAudits, failedBestPracticesAudits, warnings, benchmarkIndex, cpuSlowdown, lighthouseVersion, fetchedAt, reportUrl

Example input

{
  "urls": ["https://www.example.com", "https://www.example.com/pricing", "competitor.com"],
  "devices": ["mobile", "desktop"],
  "saveHtmlReport": true
}

Example output

{
  "url": "https://www.heise.de/",
  "device": "desktop",
  "performanceScore": 56,
  "accessibilityScore": 79,
  "bestPracticesScore": 96,
  "seoScore": 92,
  "largestContentfulPaintMs": 1784,
  "cumulativeLayoutShift": 0.01,
  "totalBlockingTimeMs": 1514,
  "firstContentfulPaintMs": 522,
  "speedIndexMs": 2746,
  "serverResponseTimeMs": 96,
  "coreWebVitalsLabPass": false,
  "pageWeightBytes": 777911,
  "requestCount": 69,
  "domElements": 4678,
  "opportunities": [
    { "id": "mainthread-work-breakdown", "title": "Minimize main-thread work", "displayValue": "3.7 s", "savingsMs": 1500 },
    { "id": "bootup-time", "title": "Reduce JavaScript execution time", "displayValue": "1.9 s", "savingsMs": 1000 }
  ],
  "failedSeoAudits": [
    { "id": "image-alt", "title": "Image elements do not have `[alt]` attributes", "items": 40 }
  ],
  "lighthouseVersion": "13.5.0",
  "reportUrl": "https://api.apify.com/v2/key-value-stores/.../records/report-ad70a43a7f3c"
}

How it measures

• Mobile uses Lighthouse's default phone profile with simulated slow 4G and 4x CPU slowdown; desktop uses its desktop profile. These are the settings PageSpeed Insights uses for its lab section.
• Results are lab data from one run in a cloud container. Like any Lighthouse run, scores move a few points between runs; benchmarkIndex shows how fast the test machine was. Real-user field data (CrUX) is not included.
• coreWebVitalsLabPass is true when LCP is 2.5 s or less, CLS is 0.1 or less and TBT (the lab stand-in for INP) is 200 ms or less.
• Pages that fail to load (DNS errors, blocks, timeouts) come back with an error and are not charged.

Uses

• SEO and web agencies: audit a client's key pages in bulk and hand over a spreadsheet of fixes
• Developers: check performance budgets before and after a release
• Monitoring: weekly scheduled runs to catch regressions
• Prospecting: find slow local-business sites that need help; pair with Website Tech Stack Detector and SEO Site Audit Scraper

Pricing

• $0.02 per completed audit (one URL on one device)
• No start fee. URLs that fail to load are free.