Site too slow, please start using event delegation

Each page on the site has 200-500+ event listeners in Javascript despite many of them doing exactly the same thing. Looking at the pages in Web Inspector I can see they’ve got individual listeners as they’re created (the way we did things 20 years ago when pages were smaller) instead of delegating to a container element (which automatically applies to any new elements as the page scrolls).

There are some articles on doing this in React, where the event handler is attached to the container element (usually a `div