Does this run Lighthouse?

No. It measures the real server response (headers, timing, payload) and inspects the returned HTML, which is faster and works on any host.

Why does the request go through your server?

Browsers cannot read cross-origin response headers or timings, so the fetch runs server-side and only public information is returned.

Why did a site fail to load?

Some hosts block automated clients, require cookies, or sit behind a bot firewall. Try the canonical URL, including https://.

Is the score official?

No. It is a simple pass/fail tally of the checks shown, meant as a quick triage list rather than a Core Web Vitals score.

Does it work offline and on mobile?

Yes. Once the page has loaded it keeps working without a network connection, and the layout is responsive so it stays usable on phones and tablets.

Web Performance Analyzer

Measure TTFB, page size, compression, caching and resource counts for any URL.

Support

No Login

No API

Page URL

Enter a page URL to measure TTFB, payload size, compression, caching and resource counts.

About the Web Performance Analyzer

Enter a URL and get a server-side performance snapshot: time to first byte, full response time, document size, text compression, Cache-Control and ETag validation, HSTS, redirects, and the number of scripts, stylesheets, images, fonts and iframes found in the HTML — each with a plain-English fix. Page speed and clean delivery are core ranking factors, so this doubles as a technical SEO audit.

Examples

Homepage audit

https://example.com

Output

TTFB 210 ms · 42 KB · br · score 83

Keyboard shortcuts

Copy the main outputCtrl / ⌘ + Shift + C
Download the resultCtrl / ⌘ + S
Share this toolCtrl / ⌘ + Shift + S
Reset the inputsAlt + R
Open the tool search paletteCtrl / ⌘ + K

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Frequently asked questions

OpenSSL commands and key formats, explained without the man page
CSRs, self-signed certificates, PEM vs DER vs PKCS#8 vs JWK, and how to check what a certificate actually contains.
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Download, upload, jitter and packet loss each tell a different story. Here is how a browser-based speed test measures them and what the results imply for your connection.

Comments

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Version 1.0.0 · Updated 2026-09-08 · Runs entirely in your browser