Rebuilding a slideshow used to redo the whole thing, including every video and every slide that had not changed. It now reuses what is already done and only rebuilds what actually moved.
Data refreshes in seconds, not minutes
Uploaded videos are prepared once instead of on every rebuild, and unchanged slides are reused. Slideshows built from live data and slideshows containing video benefit the most.
Nothing is rebuilt for a screen that is not watching
Slideshows that no screen or schedule currently plays are left alone when their data refreshes. The moment something starts showing one again, it is brought up to date first.
What this means for you: a change to your live data reaches your screens noticeably sooner, and the queue is not busy with work nobody is waiting for.