www.windguru.cz speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 15:19 UTC. Grade C (77/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 234 ms 27%
- TCP connect 152 ms 17%
- Server wait 495 ms 56%
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 881 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 429.4 KB over 12 request(s), which is lean. Javascript files are 87% of it, so defer what is not needed for the first screen, and drop tags nobody uses.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/3, so the assets share a connection instead of opening one each.
- 95% of the weight comes from other hosts (analytics, fonts, embeds), which also means their slow day becomes your slow day.
- The largest element painted at 1.49 s, inside the 2.5 s Google calls good.
- Layout shift is 0.105 (good is under 0.1): something without a reserved size is loading late - an image, an ad, or a font swap.
- The main thread was blocked for 719 ms, so taps and scrolling wait while scripts run.
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. 12 request(s) in total, 429.4 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 881 ms. Of that, 495 ms was the server thinking and 386 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.
Render-blocking resources
high impact7 render-blocking resource(s) in the document head (4 script(s), 3 stylesheet(s)). The page cannot paint until each one arrives.
Fix: Add defer or async to scripts that do not change the first paint, inline the critical CSS, and load the rest with media="print" plus an onload swap.
Cache static assets
medium impact8 asset(s) answer without a Cache-Control max-age, so browsers revalidate them on every visit.
Fix: Version filenames on change and serve them with a long max-age plus immutable. That is what makes a returning visitor fast.
Third-party weight
medium impact3 third-party host(s) serve 407.7 KB of this page. Each one is another DNS lookup, TLS handshake and point of failure you do not control.
Fix: Self-host the libraries you can, drop the tags you cannot justify, and preconnect the ones you keep.
JavaScript weight
medium impact1 JavaScript file(s) over 200 KB: maplibre-gl.js (269.1 KB)
Fix: Split routes, remove unused dependencies, and prefer a two-file build (one pinned library, one application bundle) over many small ones.
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.windguru.cz/img/windguru-icon-192x192.png | images | 200 | 836 ms | 4.7 KB |
| https://www.windguru.cz/manifest.json | other | 200 | 786 ms | 3.5 KB |
| https://www.windguru.net/wg/css/prod/index.2b6af7ba4f3c38fb.css 3rd party | css | 200 | 699 ms | 20.7 KB |
| https://www.windguru.cz/img/windguru-logotyp-new-web-pro.svg | images | 200 | 661 ms | 4.3 KB |
| https://www.windguru.cz/js/prebid-ads.js | javascript | 200 | 646 ms | 21 B |
| https://www.windguru.net/wg/js/dist/777/main-wg.js 3rd party | javascript | 200 | 595 ms | 15.0 KB |
| https://www.windguru.net/wg/js/prod/libs-wg.7c8bda20e888b9ef.js 3rd party | javascript | 200 | 582 ms | 87.7 KB |
| https://unpkg.com/[email protected]/dist/maplibre-gl.js 3rd party | javascript | 200 | 573 ms | 269.1 KB |
| https://fonts.googleapis.com/css2?family=Open+Sans:wght@300;400;600;700&family=Roboto:wght@300;400;500;700&family=Inter:wght@300;400;600&display=swap 3rd party | css | 200 | 572 ms | 430 B |
| https://unpkg.com/[email protected]/dist/maplibre-gl.css 3rd party | css | 200 | 554 ms | 9.8 KB |
| https://www.windguru.net/img/windguru-icon-196x196.png 3rd party | images | 200 | 533 ms | 5.1 KB |
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