www.leeds.ac.uk speed test — 20 Oct 2026
Measured from the wfix.shop server on 20 October 2026 at 14:44 UTC. Grade C (72/100), with the screenshots, the timings and the fixes that matter.
Where the first byte went
- DNS lookup 75 ms 6%
- TCP connect 31 ms 3%
- Server wait 1.05 s 91%
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 1.16 s. Everything else waits for that number, so the server is where to start: caching, a slow query, or an overloaded host.
- The page transfers 842.5 KB over 26 request(s). Images files are 77% 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.
- 24% 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, 842.5 KB across all of them.
Top issues
Server response time (TTFB)
high impactThe first byte arrived after 1155 ms. Of that, 1049 ms was the server thinking and 106 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.
Image delivery and format
high impact1 image(s) over 200 KB and 1 large image(s) still served as JPEG or PNG.
Fix: Serve WebP or AVIF with a JPEG fallback, size images to the space they occupy, and lazy-load anything below the fold. Images are usually more than half of a slow page.
Render-blocking resources
high impact3 render-blocking resource(s) in the document head (1 script(s), 2 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 impact2 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.
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://jaducdn.leeds.ac.uk/uol-ds/1.0.22/scripts/modernizr-custom.js 3rd party | javascript | 200 | 1.14 s | 2.7 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-Untitled_design__9__2.png | images | 200 | 1.12 s | 28.3 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-Untitled_design__8__2.png | images | 200 | 1.07 s | 17.3 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-Untitled_design__7__4.png | images | 200 | 1.06 s | 17.5 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-Untitled_design__6__6.png | images | 200 | 1.03 s | 16.4 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-QEP_450x300.jpg | images | 200 | 1.01 s | 30.4 KB |
| https://www.leeds.ac.uk/images/resized/565x757-0-0-1-80-Untitled_design__11__2.png | images | 200 | 1.01 s | 67.3 KB |
| https://www.leeds.ac.uk/images/resized/565x757-0-0-1-80-Untitled_design__9__1.png | images | 200 | 1.00 s | 55.3 KB |
| https://www.leeds.ac.uk/images/resized/334x330-0-0-1-80-Untitled_design__12__2.png | images | 200 | 991 ms | 22.4 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/css/style.css 3rd party | css | 200 | 989 ms | 62.2 KB |
| https://www.leeds.ac.uk/images/resized/565x757-0-0-1-80-Untitled_design__10_.png | images | 200 | 989 ms | 52.1 KB |
| https://production2.leeds.ac.uk/jaducdn/site/javascript/funnelback/uolKeyTasksWidgetFunnelbackSearch.min.js?v=1791891771 3rd party | javascript | 200 | 989 ms | 406 B |
| https://production2.leeds.ac.uk/jaducdn/site/javascript/forms.min.js?v=1791891771 3rd party | javascript | 200 | 988 ms | 477 B |
| https://www.leeds.ac.uk/images/resized/567x707-0-0-1-80-Untitled_design__34__3.png | images | 200 | 987 ms | 57.5 KB |
| https://www.leeds.ac.uk/images/resized/1600x400-0-0-1-80-Untitled_design__21__2.png | images | 200 | 982 ms | 210.9 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/favicons/apple-touch-icon.png 3rd party | images | 200 | 979 ms | 3.5 KB |
| https://www.leeds.ac.uk/images/resized/450x300-0-0-1-80-Untitled_design__52__2.png | images | 200 | 975 ms | 48.9 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/scripts/uol-cookie-control.js?version=0.1 3rd party | javascript | 200 | 973 ms | 39.9 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/favicons/favicon.ico 3rd party | images | 200 | 973 ms | 14.7 KB |
| https://production2.leeds.ac.uk/jaducdn/site/javascript/funnelback/UoLFunnelbackSearch.min.js?v=1791891771 3rd party | javascript | 200 | 973 ms | 4.9 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/favicons/favicon.svg 3rd party | images | 200 | 972 ms | 1.7 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/favicons/favicon-96x96.png 3rd party | images | 200 | 971 ms | 1.7 KB |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/favicons/site.webmanifest 3rd party | other | 200 | 970 ms | 436 B |
| https://jaducdn.leeds.ac.uk/uol-ds/1.0.22/scripts/bundle.js 3rd party | javascript | 200 | 952 ms | 70.2 KB |
| https://use.typekit.net/xpd0xwa.css 3rd party | css | 200 | 855 ms | 790 B |
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