On the DreamKey DreamOn collection volume 2, there's a demo of Rayman 2: The Great Escape. It appears to be a timed demo, but might not be. Would it be worth trying to speedrun? It would certainly be shorter than the main game.

Well, up to now we have a full speedrun of Dreamcast as a misc category and there is just 1 runner of it. I don't think demo even deserves to go on leaderboards. For people who want something shorter than Any% we have Treasure%.