Website Speed Test – Load Time, TTFB and Page Weight

About Website Speed Test

Use this website speed test when a page feels slow, after moving to a new host or CDN, or before and after an optimization. From our server we time DNS, connection, TLS, time to first byte, download and redirects, then load up to 80 resources found in the HTML, including scripts, styles, images and the favicon, and record each one's size, status, compression and cache headers.

You get a score, a timeline of where the time goes, page weight, request count and HTML size, plus checks for a slow first byte, redirects, missing compression, render-blocking files, short cache lifetimes, uncompressed CSS or JavaScript, images over 300 KB, broken resources and very large pages. Test as a desktop or phone browser. It's one location, not a multi-city test, and JavaScript isn't run. Where available, Also measure Core Web Vitals adds Google PageSpeed Insights lab scores and real-user data. Shrink heavy images with Compress Image.

How to use Website Speed Test

1. 1
   Enter the page address

   Test the home page first, then any page that feels slow.

2. 2
   Pick desktop or phone

   The phone option uses a mobile browser's user agent, so sites with a separate mobile page serve that one.

3. 3
   Click Test speed

   Timing, loading the resources and running the checks can take up to half a minute.

4. 4
   Fix the biggest items

   Start with failed checks, then the Resources table, which lists the heaviest files first.

Why use Cubfile for this

• Step-by-step timing

  DNS, connection, TLS, first byte, download and redirect time on one timeline.

• Up to 80 resources

  Size, status, compression and cache lifetime of each script, style and image found.

• Practical checks

  From time to first byte and render-blocking files to images over 300 KB and broken files.

• Optional Core Web Vitals

  Where available, add Google PageSpeed lab scores and real-user data.