Make it easy to move static content (i.e. static images) to different domain (so no cookies are sent).
Maybe implement a config option to easily change the path to all static content. (Obviously, the syncing to a CDN server needs to be done by an external source or a plugin.) Although this might be more complicated with CSS and JS, but it should be doable.
This was suggested here: https://forum.dokuwiki.org/thread/7766