WebPageTest

webpagetest.org

Loads your page from a chosen city and browser and films the result.

No sign-upClassicRuns on their server

What it does

The deep version of a speed test: pick a location, a real browser, a connection profile, and get a waterfall of every request, a filmstrip of the render and a video you can scrub. Repeat-view runs show what your caching headers actually do. It answers 'why is it slow' where a score only tells you that it is. Free tests queue behind everyone else, and reading a waterfall properly is a skill rather than a glance.

Best for

  • Diagnosing a slow page properly
  • Checking load time from another country

Where it stops

Free tests sit in a shared queue at busy times, and the results need interpreting rather than reading.

AltFTool does this too

If you would rather not leave the site, Web Speed Checker covers the same job here — free, no account, and it runs in your browser.

Open Web Speed Checker

Questions

About WebPageTest

Is WebPageTest free?

Works the moment the page loads. No account, no email, no trial. Free tests sit in a shared queue at busy times, and the results need interpreting rather than reading.

Does WebPageTest upload my files?

Yes. WebPageTest sends your input to its own servers to process it. That is fine for public material; for anything containing personal data, use one of the on-device tools instead.

What are the limitations of WebPageTest?

Free tests sit in a shared queue at busy times, and the results need interpreting rather than reading.

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