zlib.net speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 13:57 UTC. Grade A (99/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 74 ms 41%
- TCP connect 22 ms 12%
- Server wait 86 ms 47%
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 server answered in 182 ms, which is fast: almost all of the wait is the page itself, not the host.
- The page transfers 50.3 KB over 9 request(s), which is lean. Images files are 82% of it, so resize and recompress the largest images before anything else.
- The HTML itself arrives gzip-compressed.
- It runs over HTTP/2, so the assets share a connection instead of opening one each.
- The largest element painted at 288 ms, inside the 2.5 s Google calls good.
Fix first: Mobile viewport - Add a viewport meta tag with width=device-width and an initial scale of 1.
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. 9 request(s) in total, 50.3 KB across all of them.
Top issues
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://zlib.net/images/li_blue.png | images | 200 | 354 ms | 322 B |
| https://zlib.net/madler-email.png | images | 200 | 336 ms | 1.4 KB |
| https://zlib.net/images/li_yellow.png | images | 200 | 335 ms | 318 B |
| https://zlib.net/images/li_red.png | images | 200 | 334 ms | 322 B |
| https://zlib.net/zlib-email.png | images | 200 | 329 ms | 942 B |
| https://zlib.net/images/zlib_ddj.png | images | 200 | 328 ms | 16.8 KB |
| https://zlib.net/images/zlib3d-b1.png | images | 200 | 327 ms | 20.9 KB |
| https://zlib.net/images/li_green.png | images | 200 | 326 ms | 325 B |
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