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PerformanceChecked through WebDiag API

Server-Timing Analyzer

Enter a URL to parse the Server-Timing header and inspect backend timing signals exposed to clients.

  • Server-Timing
  • dur / desc
  • single response
Online tool

Try the tool

Enter a URL: WebDiag will run a safe network check and show the result.

URL

Network check through backend

For HTTP/SEO tools, the URL is sent to the WebDiag API, where SSRF protection, DNS/IP policy, and redirect limits are applied.

Reviewed: 2026-07-17
01

How to use it

  1. 1

    Enter a public http/https URL.

  2. 2

    Run response-header analysis.

  3. 3

    Review metric names, duration, and description values.

02

What the tool can do

  • Parses Server-Timing header metrics.
  • Shows dur= and desc= parameters.
  • Does not replace Lighthouse or RUM analytics.
03

Common use cases

  • Check whether backend timing metrics are published.
  • Find missing Server-Timing before performance work.
  • Validate metric formatting after a release.
04

How it works inside

The tool reads a header, not a synthetic benchmark.

The result depends on the URL and cache/CDN layer.

05

Questions and answers

Is this a PageSpeed replacement?

No. Server-Timing exposes server-published metrics; PageSpeed and RUM measure different performance layers.

Why is the header missing?

Many sites do not publish Server-Timing or hide it at the CDN/cache layer.