Measured, not estimated
What this site weighs
“A light site” is an empty phrase for as long as no figure follows it. Here are ours, taken on 6 August 2026 across the 26 published pages, one by one. This page is written by the measurement itself: nobody copies a figure into it.
639 kB
The average weight of a page on a first visit, nothing in memory, files taken as they come.
228 kB
What those same files weigh once compressed, as they travel over the network.
15 files
The number of files a page asks for on average in order to display, 18 at most.
How it is measured
A program opens each page in a real browser, scrolls it to the bottom, and weighs everything that travelled. The method is deliberately unkind to us, because a flattering figure is of no use:
- first visit, nothing already held in memory;
- page read to the bottom, so everything that loads along the way counts;
- uncompressed bytes for the headline figure, which is the worst case;
- page by page: no overall average is allowed to hide the heaviest one.
Where the bytes go
Across all the pages measured:
- 42 % - the code that makes the page work
- 41 % - the styling
- 13 % - the typefaces
- 4 % - the text of the page
The text of a page weighs 27 kB on average: it is the smallest share of the weight. 10 files are the same on every page: from the second page on, the display no longer waits for them, they are served from the device and refreshed behind.
Page by page
From the heaviest to the lightest. No page is left off the list.
| Page | Weight | Files |
|---|---|---|
| Work-related road risk | 870 kB | 16 |
| Local authorities | 870 kB | 16 |
| Associations | 858 kB | 16 |
| Back on two wheels, cornering & motorcycle road trips | 856 kB | 18 |
| Driving schools | 683 kB | 17 |
| Home | 674 kB | 16 |
| App | 669 kB | 15 |
| Road safety | 662 kB | 17 |
| Resources & advice | 648 kB | 15 |
| CITS | 637 kB | 14 |
| Frequently asked questions | 627 kB | 15 |
| Which course is right for you? | 616 kB | 15 |
| Our courses | 615 kB | 15 |
| Glossary of driving and road safety | 615 kB | 15 |
| One App screen, with your own figures | 613 kB | 16 |
| Funding your training | 613 kB | 15 |
| About | 613 kB | 15 |
| Local authorities: engaging us through public procurement | 612 kB | 15 |
| Supervising three jobs at once | 611 kB | 15 |
| How this site is built | 611 kB | 15 |
| Sitemap | 611 kB | 15 |
| What App does, and what it does not | 610 kB | 15 |
| The questions people really ask | 610 kB | 15 |
| Bringing your data in, and taking it away | 610 kB | 15 |
| Search | 600 kB | 15 |
| Service status | 10 kB | 3 |
What we also check
Every page on a small screen
Every page is opened on a screen 360 points wide, the screen of an entry-level phone: none of them spills over sideways, neither at rest nor with the menu open.
No page left stranded
A page that no link reaches does not exist. The list of the site's pages is set against the list of its links: any page nothing reaches is flagged.
The internal links
Every link on the site is resolved down to the file it points at, anchors included, at every change to the site. A broken link stops publication.
A remark about these figures?
A measurement open to argument deserves the argument. Write to us: if the method can be improved, it will be corrected and the page will follow.