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Free tool by DeveloperLook

Free website speed test

Measure TTFB, load time, compression, caching and render-blocking resources from one URL.

Free, no signupPassive checksDownloadable report

Only scan sites you own or have permission to test.

Also free:Security scannerSEO checkerProject calculator

Sample report

Speed report · Grade B

  • Time to first byte:
  • HTML load time:
  • Compression:
  • Render-blocking scripts:

What we check

Every check the speed test runs

The test measures how your server answers and what the page asks the browser to load: timing, compression, caching, scripts, images and third parties. It reads delivery signals, not a lab browser run.

TTFBdocumentstyles.cssapp.jsfont.woff2hero.webpanalytics.jsLoad 1.2s

Website speed test · 8 check groups

Measure TTFB, load time, compression, caching and render-blocking resources from one URL.

  • TTFB from our edge, not Lighthouse; measures when HTML headers arrive

  • Full HTML download time including redirect hops

  • gzip/Brotli on HTML, document weight, inline script/CSS bloat

  • Cache-Control on HTML and up to 12 sampled CSS/JS files

  • Scripts in <head> without defer/async, stylesheet count

  • Lazy loading, width/height (CLS), WebP/AVIF references in HTML

  • External script hosts, preconnect/dns-prefetch hints

  • HTTP/2 indicator, preload/prefetch links, font-display

Speed and delivery signals

The speed scan measures server-side timing and delivery cues such as TTFB, compression, caching headers, and render-blocking assets.

What it is not

It is not a lab Lighthouse run and does not produce Core Web Vitals from a real browser. Use it to spot obvious delivery problems before a deeper performance engagement.

Findings are grouped by severity. A green Passed result is not a warranty that the site is secure or fully optimized. Re-scan after you ship fixes, dependency upgrades, or infrastructure changes.

  • CriticalStart here. Affects authentication, transport security, or indexability.
  • HighFix in the same pass as critical items.
  • MediumUsually a configuration improvement.
  • LowSmall hardening or polish, worth batching into a later release.
  • InfoDocuments what was observed so you can decide whether it matters for your stack.
  • PassedThat check did not find a problem on this pass.

How it works

From URL to report in three steps

Scan flow

  1. example.comURLEdgeHeadersHTMLFiles82ScoreReport

    01Enter URL

  2. example.comURLEdgeHeadersHTMLFiles82ScoreReport

    02Run the test

  3. example.comURLEdgeHeadersHTMLFiles82ScoreReport

    03Fix & re-test

  1. 01Enter a URL

    Paste the page you want to test. No account, credit card or setup.

  2. 02Run the speed test

    We request the page from our edge, time the response and the HTML download, and sample up to 12 of its CSS and JS files for compression and caching.

  3. 03Fix and re-test

    Work through findings by impact, download the report, and re-test after each change.

Test or optimize

When a quick test is not enough

The speed test finds delivery problems in seconds. Core Web Vitals, real-visitor data and the fixes themselves need a deeper look.

FreeNo sign-up, results in seconds

Free website speed test

  • TTFB
  • Load time
  • Caching
  • Render blocking

The test checks

  • Server response time (TTFB) and HTML load time
  • Compression, caching and page weight
  • Render-blocking scripts, images and third parties
  • A score, ranked findings and a downloadable report

The test does not

  • A lab browser run or a Lighthouse score
  • Core Web Vitals from real visitors
  • Every page of your site
  • Changes to your code or hosting

Optimization adds

  • A Core Web Vitals review with real-visitor data
  • Image, font and script optimization
  • Caching, CDN and hosting tuning
  • Theme and plugin clean-up
  • Before and after measurements

Related servicesWebsite speed optimizationCore Web Vitals optimizationShopify speed optimization

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FAQ

Questions about the speed test

  • Yes. It is free to use with no account, credit card or sign-up, and you can test as many pages as you need.

  • Server response time (TTFB) from our edge, HTML download time including redirects, gzip or Brotli compression, page weight, cache headers on the HTML and up to 12 CSS and JS files, render-blocking scripts and stylesheets, image loading and sizing, third-party hosts, and HTTP/2, preload and font-display hints.

  • No. Those load the page in a lab browser and report Core Web Vitals. This test reads server timing and delivery signals, so it is quick and points at causes such as missing compression or caching. Use both: this test for fast fixes, PageSpeed Insights for real-visitor metrics.

  • The test treats 600 ms or less as good, flags slower responses, and marks anything over 1.2 seconds as high severity. Slow responses usually come from hosting, missing page caching or heavy server-side code.

  • Network routes, server load and caches vary from one request to the next. Run the test a few times and compare, especially right after a deploy or a cache clear.

  • No. It makes one request for the page plus a small sample of its CSS and JS files, about what a single visitor loads.

  • Every finding comes with its evidence and how to fix it. If you would rather hand it over, our website speed optimization team fixes it and measures the result.

Saimul IslamFounder & CEO, DeveloperLook

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