Tested 2026-07-27 21:58:57 using Firefox (runtime settings)
The top lists point out the specific files to fix first: the largest and slowest assets across all tested pages, and the assets returning visitors have to download again.
Every JavaScript byte is downloaded, parsed and executed on the main thread, so trimming the biggest bundles pays off twice.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 5 minutes | 22.5 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 8.1 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 18.0 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 192.7 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 28.1 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 3.0 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 2.0 KB | |
| https://auth.wikimed...gin/checkLoggedIn → run | -1 second | 0 seconds | 1.7 KB |
CSS blocks rendering until it is downloaded and parsed, so the biggest files delay first paint the most.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 5 minutes | 25.0 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 5 minutes | 3.4 KB |
Images are usually the easiest bytes to win back: resize them, compress harder or switch to a modern format like AVIF or WebP.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://upload.wikim...No_42_Trolley.jpg → run | 10 minutes | 0 seconds | 7.9 KB | |
| https://upload.wikim..._dated_1921_l.jpg → run | 11 minutes | 0 seconds | 21.9 KB | |
| https://upload.wikim..._of_Education.jpg → run | 1 week | 0 seconds | 23.9 KB | |
| https://upload.wikim...9839443910%29.jpg → run | 9 minutes | 0 seconds | 13.2 KB | |
| https://upload.wikim...2873267013%29.jpg → run | 10 minutes | 0 seconds | 15.6 KB | |
| https://upload.wikim...n_oxide_layer.jpg → run | 10 minutes | 0 seconds | 62.7 KB | |
| https://upload.wikim...mons-logo.svg.png → run | 2 years | 0 seconds | 3.1 KB | |
| https://upload.wikim...2020-icon.svg.png → run | 8 weeks | 0 seconds | 4.2 KB | |
| https://upload.wikim...nity_Logo.svg.png → run | 8 weeks | 0 seconds | 3.6 KB | |
| https://upload.wikim...ooks-logo.svg.png → run | 4 weeks | 0 seconds | 3.7 KB |
The HTML document is the first byte of everything: nothing starts rendering before it arrives.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia.org/wiki/Main_Page → run | 1 second | 0 seconds | 56.7 KB |
The largest favicon files across the tested pages.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...con/wikipedia.ico → run | 3 weeks | 1 year | 2.0 KB |
The largest other files across the tested pages.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...alAutoLogin/start → run | -1 second | 0 seconds | 1.1 KB |
The largest text files across the tested pages.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...ns-502b/v2/events → run | -1 second | 0 seconds | 997 B |
The largest SVG files across the tested pages.
| url | time since last modified | cache time | transfer | size |
|---|---|---|---|---|
| https://en.wikipedia...ons/enwiki-25.svg → run | 3 weeks | 1 year | 44.2 KB | |
| https://en.wikipedia...ordmark-en-25.svg → run | 3 weeks | 1 year | 5.1 KB | |
| https://en.wikipedia...tagline-en-25.svg → run | 3 weeks | 1 year | 5.9 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 1.3 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 1.3 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | -1 second | 4 weeks | 1.5 KB |
These assets took the longest time to download. Everything that waits for them (rendering, other requests on the same connection) is held up too.
| url | type | time since last modified | cache time | transfer | size | timing |
|---|---|---|---|---|---|---|
| https://upload.wikim..._dated_1921_l.jpg → run | image | 11 minutes | 0 seconds | 21.9 KB | 1.060 s | |
| https://upload.wikim..._of_Education.jpg → run | image | 1 week | 0 seconds | 23.9 KB | 833 ms | |
| https://en.wikipedia.org/wiki/Main_Page → run | html | 1 second | 0 seconds | 56.7 KB | 583 ms | |
| https://upload.wikim...No_42_Trolley.jpg → run | image | 10 minutes | 0 seconds | 7.9 KB | 560 ms | |
| https://en.wikipedia...tagline-en-25.svg → run | svg | 3 weeks | 1 year | 5.9 KB | 282 ms | |
| https://en.wikipedia...ordmark-en-25.svg → run | svg | 3 weeks | 1 year | 5.1 KB | 277 ms | |
| https://en.wikipedia...ons/enwiki-25.svg → run | svg | 3 weeks | 1 year | 44.2 KB | 264 ms | |
| https://en.wikipedia...ia.org/w/load.php → run | javascript | -1 second | 5 minutes | 22.5 KB | 206 ms | |
| https://en.wikipedia...ia.org/w/load.php → run | css | -1 second | 5 minutes | 3.4 KB | 187 ms | |
| https://en.wikipedia...ia.org/w/load.php → run | css | -1 second | 5 minutes | 25.0 KB | 149 ms |
Assets with a short cache time are re-downloaded by returning visitors. A longer cache lifetime makes repeat visits faster for free.
| url | type | time since last modified | cache time | transfer | size |
|---|---|---|---|---|---|
| https://upload.wikim...n_oxide_layer.jpg → run | image | 10 minutes | 0 seconds | 62.7 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | css | -1 second | 5 minutes | 25.0 KB | |
| https://upload.wikim..._of_Education.jpg → run | image | 1 week | 0 seconds | 23.9 KB | |
| https://en.wikipedia...ia.org/w/load.php → run | javascript | -1 second | 5 minutes | 22.5 KB | |
| https://upload.wikim..._dated_1921_l.jpg → run | image | 11 minutes | 0 seconds | 21.9 KB | |
| https://upload.wikim...2873267013%29.jpg → run | image | 10 minutes | 0 seconds | 15.6 KB | |
| https://upload.wikim...9839443910%29.jpg → run | image | 9 minutes | 0 seconds | 13.2 KB | |
| https://upload.wikim...No_42_Trolley.jpg → run | image | 10 minutes | 0 seconds | 7.9 KB | |
| https://upload.wikim...2020-icon.svg.png → run | image | 8 weeks | 0 seconds | 4.2 KB | |
| https://upload.wikim...ooks-logo.svg.png → run | image | 4 weeks | 0 seconds | 3.7 KB |
