A group can move quickly once its real point of disagreement is clear.

Meetings stall less because people disagree than because nobody has said out loud what the disagreement is about. Everyone argues around the edge of it, agreeing on principles, rewording the same sentence, checking the same facts twice. Once someone names the actual fork, the conversation gets short, because most of the delay was the search rather than the decision.

When a discussion loops, try saying what you think the real split is and ask whether that is right. Being slightly wrong is fine, because it prompts the correction that gets everyone there.