Speed, caching and privacy

One stylesheet and one script, minified, together about 8KB as a browser downloads them, loaded only on pages that render a timer; a page with Countdown content and no timer gets the script alone. It never loads jQuery, and there are no web fonts and no third-party requests.

The remaining time is rendered on the server and the script recomputes it from a timestamp in the markup, so a page served from a cache an hour later still shows the right number. The only thing stored about a visitor is when they first saw a per-visitor campaign, in a cookie on their own machine.