gwdg.de speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 15:42 UTC. Grade B (84/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 91 ms 12%
- TCP connect 202 ms 27%
- Server wait 444 ms 60%
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 736 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 488.2 KB over 24 request(s). Images files are 56% of it, so resize and recompress the largest images before anything else.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/3, so the assets share a connection instead of opening one each.
- The largest element painted at 1.45 s, inside the 2.5 s Google calls good.
- Layout stayed still (CLS 0.002), so nothing jumps under the reader's cursor.
- The main thread was blocked for 12 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. 24 request(s) in total, 488.2 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 736 ms. Of that, 444 ms was the server thinking and 293 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 impact1 text response(s) of 10 KB or more are sent uncompressed, and the document itself is not compressed. That is 90.9 KB 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.
TLS certificate validity
high impactThe certificate for gwdg.de has 17 day(s) left.
Fix: Renew automatically (certbot with a working renewal timer) and alert on the certificate, not on the renew command, so a silent failure is caught weeks before a browser warning.
Mobile viewport
medium impactNo viewport meta tag, so a phone renders the desktop layout scaled down.
Fix: Add a viewport meta tag with width=device-width and an initial scale of 1.
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://gwdg.de/images/logos/gwdg_logo.min.svg | images | 200 | 1.51 s | 17.1 KB |
| https://gwdg.de/images/gwdg_background_hu_183578a74bf0178f.webp, | html | 404 | 1.51 s | 12.8 KB |
| https://gwdg.de/images/gwdg_background_hu_183578a74bf0178f.webp | images | 200 | 1.47 s | 3.1 KB |
| https://gwdg.de/images/logos/gwdg_logo_only_invert.min.svg | images | 200 | 1.40 s | 1002 B |
| https://gwdg.de/scss/main.min.f089b14e08ed3076bc5da9b54eb3bf5d59ddfcc9a369b2d269c01bebc3e5d9c6.css | css | 200 | 1.39 s | 16.4 KB |
| https://gwdg.de/js/main.min.8a5613c24b74b2516f484800b298a87f6c053db3df9e3fd79cad63a0da1f89d6.js | javascript | 200 | 1.39 s | 90.9 KB |
| https://gwdg.de/favicon.ico | images | 200 | 1.39 s | 63.3 KB |
| https://gwdg.de/images/mobile_working_hu_527de6eda610fccd.webp, | html | 404 | 1.38 s | 12.8 KB |
| https://gwdg.de/images/logos/ISO-9001_de_hu_887597ad60a1456.png, | html | 404 | 1.38 s | 12.8 KB |
| https://gwdg.de/images/logos/ISO-9001_de_hu_887597ad60a1456.png | images | 200 | 1.38 s | 8.4 KB |
| https://gwdg.de/images/logos/ISO-27001_de_hu_3da854f1805e5adc.png, | html | 404 | 1.38 s | 12.8 KB |
| https://gwdg.de/images/logos/ISO-27001_de_hu_3da854f1805e5adc.png | images | 200 | 1.38 s | 10.0 KB |
| https://gwdg.de/about-us/gwdg-news/header_hu_f7edccb4ee2fbe65.webp | images | 200 | 1.37 s | 40.8 KB |
| https://gwdg.de/images/mobile_working_hu_527de6eda610fccd.webp | images | 200 | 1.37 s | 16.5 KB |
| https://gwdg.de/services/network-services/setting-up-eduroam/header_hu_252159cd0e968361.webp, | html | 404 | 1.36 s | 12.8 KB |
| https://gwdg.de/services/general-services/url-shortener/header_hu_97c9178dbe5f25fc.webp | images | 200 | 1.36 s | 10.1 KB |
| https://gwdg.de/services/general-services/url-shortener/header_hu_97c9178dbe5f25fc.webp, | html | 404 | 1.36 s | 12.8 KB |
| https://gwdg.de/about-us/gwdg-news/header_hu_f7edccb4ee2fbe65.webp, | html | 404 | 1.36 s | 12.8 KB |
| https://gwdg.de/services/network-services/setting-up-eduroam/header_hu_252159cd0e968361.webp | images | 200 | 1.35 s | 10.6 KB |
| https://gwdg.de/hpc/header_hu_24005e0e7ef5b492.webp, | html | 404 | 1.35 s | 12.8 KB |
| https://gwdg.de/hpc/header_hu_24005e0e7ef5b492.webp | images | 200 | 1.35 s | 59.1 KB |
| https://gwdg.de/images/logos/uni.min.svg | images | 200 | 1.35 s | 7.1 KB |
| https://gwdg.de/images/logos/mpg-with-text.min.svg | images | 200 | 1.34 s | 25.8 KB |
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