Yesterday I hit the ‘s’ key in darktable instead of ‘d’, activating the slideshow, on a collection with maybe 500 images. Darktable became completely unresponsive; at some point its window even disappeared. Just by coincidence, the same issue was opened today: Slideshow completely freezes Darktable, must be killed · Issue #12924 · darktable-org/darktable · GitHub
That issue has been locked, so I wanted to bring it up here. I think that adding some kind of “progress meter”, or feedback of some kind, to let the user know that patience is needed, would not be a bad idea. Even better would be a way to interrupt the generation of the slideshow. I would also suggest a different default key shortcut, maybe ‘S’ instead of ‘s’.
Just some food for thought.