Thanks for your reply.
So quick deploy is standard only possible on page level. This means that if an update is done in the Reusable content list or in the image library, that the page on which the item is used must be (quickly) deployed. So this procedure needs to happen on all pages where the list item is used?
It would be more practical if the list item could be deployed to all pages where it used. This way you only need to deploy it once.
But maybe we can use the Incremental Deploy (Run now), as commented by Thomson. But this means that the entire site will be deployed, looking for changes on the entire site?
Thanks for your help,