Website Speed Test Documentation

Test how fast a website loads: time to first byte, DNS, connection, TLS, download time, page size, compression, and render-blocking resources.

SiteIndex requests the page from its server with a fresh connection and times each phase: DNS lookup, TCP connect, TLS handshake, server wait, and download. It follows redirects, decompresses the HTML, and checks compression, page weight, render-blocking scripts in the head, script and stylesheet counts, image dimensions, and third-party script hosts. The Advanced panel runs three uncached samples to show min, average, and max TTFB.

• Check whether a slow site is caused by the server (high TTFB) or by page weight.
• Verify that Brotli or gzip compression and caching are enabled after a deploy.
• Find redirect hops and render-blocking scripts that delay the first paint.

Input

A public website, domain, or network value required by the check.

Output

A result shown in the browser that can be reviewed or copied where supported.

• Results depend on the input, browser, network, and external service involved.
• This tool is informational and does not replace specialist diagnostics.

The requested public target is sent to SiteIndex only as needed to perform the check. SiteIndex does not require an account or intentionally store the target as a report. See the Privacy Policy for analytics and retention details. Read the Privacy Policy.