www.cra.cz speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 14:49 UTC. Grade B (85/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 68 ms 9%
- TCP connect 156 ms 22%
- Server wait 501 ms 69%
Measured on the connection that fetched the HTML. Every other request on the page waits for the end of this bar before it can start.
How this page compares
Every report published here is in this comparison, so it is a reference population of pages tested from one server - not a benchmark of the whole web.
What these numbers mean
- The first byte took 725 ms. Everything else waits for that number, so the server is where to start: caching, a slow query, or an overloaded host.
- The page transfers 142.8 KB over 25 request(s).
- It runs over HTTP/3, so the assets share a connection instead of opening one each.
- 26% of the weight comes from other hosts (analytics, fonts, embeds), which also means their slow day becomes your slow day.
- The largest element took 3.48 s to paint, past the 2.5 s threshold: usually a hero image that is too big or a render-blocking script in front of it.
- The main thread was blocked for 104 ms in total, which is not enough to feel.
Fix first: Server response time (TTFB) - Cut server think time: page cache, query indexes, fewer synchronous calls to third parties inside the request. Connection setup is distance, so a nearer region or a CDN edge helps instead.
Read on one shared server, not a visitor's phone: use it to compare pages against each other, not as a promise about every connection. We fix what these tests find.
Screenshot
What the page looks like
Loaded in headless Chromium on this server. Click an image to open it full size.
Browser render
The same URL loaded in a real browser, so these are the readings curl cannot produce. The grade above is still built from the server measurements.
Page weight by type
What the page is made of
Transfer size, compressed as sent. 25 request(s) in total, 142.8 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 725 ms. Of that, 501 ms was the server thinking and 224 ms was connection setup. A first byte under 400 ms is what a visitor feels as instant.
Fix: Cut server think time: page cache, query indexes, fewer synchronous calls to third parties inside the request. Connection setup is distance, so a nearer region or a CDN edge helps instead.
Compress text responses
high impact0 text response(s) of 10 KB or more are sent uncompressed, and the document itself is compressed. That is 0 B of compressible text.
Fix: Turn on brotli (preferred) or gzip for text/css, javascript and text/html in the web server. This is the cheapest win available on almost any site.
HTML document size
medium impactThe document transfers 105.9 KB. A bloated document delays every other request, because nothing else can start until it is parsed.
Fix: Paginate long listings, move repeated markup into a template, and stop inlining large data URIs into the HTML.
Avoid extra redirects
medium impact1 redirect hop(s) before the page load started, each one a full round trip before the first byte.
Fix: Link to the canonical URL (and make sure http, the apex domain and www all point at it) so no visitor pays a redirect first.
Waterfall
Slowest requests
Each bar is one request's own response time, scaled to the slowest. Assets were fetched in parallel, so the bars overlap in real time rather than stacking. first party third party
| Request | Type | Status | Time | Size |
|---|---|---|---|---|
| https://www.cra.cz/styles/fonts/fa_webfonts/fa-regular-400.woff2 | html | 403 | 1.23 s | 0 B |
| https://www.cra.cz/styles/fonts/Nunito/Nunito-Bold.woff2 | html | 403 | 1.23 s | 0 B |
| https://www.cra.cz/styles/fonts/fa_webfonts/fa-solid-900.woff2 | html | 403 | 1.20 s | 0 B |
| https://www.cra.cz/styles/fonts/Nunito/Nunito-SemiBold.woff2 | html | 403 | 1.14 s | 0 B |
| https://www.cra.cz/cache/cz-footerFiles.js?v=XtAedpwhEIjQQgblriE12ktSO8CPZb9joODCN0jn3mbXdJcPpg | html | 403 | 1.13 s | 0 B |
| https://www.cra.cz/images/lazy_image_placeholder.svg | html | 403 | 1.13 s | 0 B |
| https://www.cra.cz/foto/clanky/midi/homepage-hero-three.webp | html | 403 | 1.12 s | 0 B |
| https://www.cra.cz/styles/img/icons/x-twitter.svg | html | 403 | 1.12 s | 0 B |
| https://www.cra.cz/files/site-graphics/site.webmanifest | html | 403 | 1.11 s | 0 B |
| https://www.cra.cz/foto/clanky/midi/homepage-hero2(2).webp | html | 403 | 1.11 s | 0 B |
| https://www.cra.cz/styles/fonts/Nunito/Nunito-Regular.woff2 | html | 403 | 1.11 s | 0 B |
| https://www.cra.cz/styles/fonts/fa_webfonts/fa-brands-400.woff2 | html | 403 | 1.11 s | 0 B |
| https://www.cra.cz/files/site-graphics/logo-cra.svg | html | 403 | 1.10 s | 0 B |
| https://www.cra.cz/cache/cz-translations.js?v=NtG0f0gdiVMuuOwhFZ9WVWJgtMsVuuJJ6PRoTxpIUcgTafMDMF | html | 403 | 1.10 s | 0 B |
| https://www.cra.cz/images/video_placeholder.mp4 | html | 403 | 1.10 s | 0 B |
| https://www.cra.cz/foto/clanky/full/homepage-hero-three.webp | html | 403 | 1.10 s | 0 B |
| https://www.cra.cz/foto/clanky/full/homepage-hero2(2).webp | html | 403 | 1.09 s | 0 B |
| https://www.cra.cz/cache/cz-default.css?v=2hakoByrmQgrXwKi9rWuaZXKPnaxqfClRYERytsoOoxHchCkhF | html | 403 | 1.09 s | 0 B |
| https://www.cra.cz/files/site-graphics/apple-touch-icon.png | html | 403 | 1.09 s | 0 B |
| https://www.cra.cz/files/site-graphics/favicon-32x32.png | html | 403 | 1.09 s | 0 B |
| https://www.cra.cz/files/site-graphics/favicon-16x16.png | html | 403 | 1.08 s | 0 B |
| https://www.cra.cz/styles/fonts/fa_webfonts/fa-light-300.woff2 | html | 403 | 1.07 s | 0 B |
| https://consent.cookiebot.com/uc.js 3rd party | javascript | 200 | 947 ms | 36.8 KB |
| https://www.googletagmanager.com/ns.html?id=GTM-N75DTDV 3rd party | html | 200 | 947 ms | 192 B |
Report this page
Run this test on your own site
The same engine, free, with the screenshots and the fixes. No account needed.