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SkySiteAudit

Page Speed Test

Measure loading performance in a real browser: LCP, CLS, Total Blocking Time, FCP, server response time, page weight and oversized images.

Working with limits

What it checks

  • Largest Contentful Paint (lab)
  • Cumulative Layout Shift (lab)
  • Total Blocking Time (lab proxy for responsiveness)
  • First Contentful Paint and TTFB
  • Image weight and text compression

Where the data comes from

Headless Chromium on SkySiteAudit's server; environment shown with each result.

Limits — stated honestly

  • Lab data from one load in headless Chromium with mobile emulation — real users may see different values.
  • INP (Interaction to Next Paint) needs real-user data and is shown as unavailable.
  • No Chrome UX Report field data is used.
  • Fair use: 20 page scans per day without an account; 10 site crawls per day with a free account. Details

Need help reading the results? See the Page Speed Test guide in the help center.