www.immoweb.be/en speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 15:41 UTC. Grade B (80/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 103 ms 18%
- TCP connect 41 ms 7%
- Server wait 439 ms 75%
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 583 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 920.4 KB over 26 request(s). Javascript files are 64% 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.
- 86% of the weight comes from other hosts (analytics, fonts, embeds), which also means their slow day becomes your slow day.
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.
The headless browser did not capture this page when the test ran, so only the server measurements are shown.
Page weight by type
What the page is made of
Transfer size, compressed as sent. 26 request(s) in total, 920.4 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 583 ms. Of that, 439 ms was the server thinking and 144 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 impact4 render-blocking resource(s) in the document head (3 script(s), 1 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.
Total page weight
medium impactThe page transfers 920.4 KB across 26 request(s), with the document itself at 130.3 KB.
Fix: Work through the heaviest assets first: images, then fonts, then third-party scripts.
Cache static assets
medium impact21 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 impact7 third-party host(s) serve 790.1 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.
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://media-resize.immowebstatic.be/customers/0012p00002Txsf3AAB/500x500/logo/4df4272a47728f248818d1d3a36300aa.jpg 3rd party | images | 200 | 998 ms | 10.4 KB |
| https://media-resize.immowebstatic.be/customers/0012p00002TxtpvAAB/500x500/logo/390e9dc4300b89d122eeb84a4b55dec0.jpg 3rd party | images | 200 | 979 ms | 6.5 KB |
| https://accounts.google.com/gsi/client 3rd party | html | 403 | 950 ms | 0 B |
| https://media-resize.immowebstatic.be/customers/0012p00002TxtD1AAJ/500x500/logo/55e52cafb5560dc794cad4e73315930e.jpg 3rd party | images | 200 | 942 ms | 8.4 KB |
| https://media-resize.immowebstatic.be/customers/001P600000r5gcnIAA/500x500/logo/d28074149d8269c06f9280b6a1b1f273.png 3rd party | images | 200 | 940 ms | 37.2 KB |
| https://assets.immoweb.be/104070/images/artworks/errors/error-500.svg 3rd party | images | 200 | 938 ms | 1.7 KB |
| https://assets.immoweb.be/104070/images/favicons/favicon-32x32.png?v=2 3rd party | images | 200 | 933 ms | 1.4 KB |
| https://www.googletagmanager.com/ns.html?id=GTM-5THNWXP 3rd party | html | 200 | 933 ms | 92 B |
| https://www.googleoptimize.com/optimize.js?id=OPT-TN5W9JB 3rd party | javascript | 200 | 931 ms | 110.6 KB |
| https://assets.immoweb.be/104070/css/app.css?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | css | 200 | 931 ms | 92.1 KB |
| https://media.immowebstatic.be/epc/pics/peb/tags/fla/d.png 3rd party | images | 200 | 931 ms | 1.4 KB |
| https://assets.immoweb.be/104070/images/favicons/apple-touch-icon.png?v=2 3rd party | images | 200 | 929 ms | 12.1 KB |
| https://media.immowebstatic.be/epc/pics/peb/tags/fla/b.png 3rd party | images | 200 | 928 ms | 1.4 KB |
| https://assets.immoweb.be/104070/js/seoLinksObfuscator.js?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | javascript | 200 | 925 ms | 4.4 KB |
| https://assets.immoweb.be/104070/js/seoObfuscator.js?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | javascript | 200 | 924 ms | 527 B |
| https://app.usercentrics.eu/browser-ui/latest/loader.js 3rd party | javascript | 200 | 920 ms | 10.2 KB |
| https://media.immowebstatic.be/epc/pics/peb/tags/fla/c.png 3rd party | images | 200 | 920 ms | 1.4 KB |
| https://media-resize.immowebstatic.be/customers/0012p00002Txt2kAAB/500x500/logo/fb47b6e0445b398ff337779df0a3185d.jpg 3rd party | images | 200 | 919 ms | 18.6 KB |
| https://media.immowebstatic.be/epc/pics/peb/tags/fla/f.png 3rd party | images | 200 | 919 ms | 1.2 KB |
| https://assets.immoweb.be/104070/js/thorConsent.js?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | javascript | 200 | 917 ms | 5.7 KB |
| https://assets.immoweb.be/104070/images/favicons/favicon-16x16.png?v=2 3rd party | images | 200 | 912 ms | 648 B |
| https://assets.immoweb.be/104070/images/logos/brand-logo.svg 3rd party | images | 200 | 911 ms | 1.1 KB |
| https://assets.immoweb.be/104070/js/app.js?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | javascript | 200 | 902 ms | 460.3 KB |
| https://assets.immoweb.be/104070/js/kameleoon.js?id=4070-4c2dca3d74415ae8f162949778cb622732eb810a 3rd party | javascript | 200 | 901 ms | 1.5 KB |
| https://assets.immoweb.be/104070/images/logos/partners/cim-logo.svg 3rd party | images | 200 | 894 ms | 1.6 KB |
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