Web Performance Analyzer
Measure TTFB, page size, compression, caching and resource counts for any 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.
Examples
Homepage audit
https://example.comOutput
TTFB 210 ms · 42 KB · br · score 83Keyboard 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
Read more
- 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.
- Internet speed tests and what the numbers actually mean
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.
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Version 1.0.0 · Updated 2026-08-17 · Runs entirely in your browser