A vacuum itself does not possess speed, as it is defined as the absence of matter. However, the air that is displaced to create a vacuum can have a speed associated with its movement. The rate at which a vacuum fills a container is contingent on how quickly air can exit the container. The discussion emphasizes that understanding vacuum dynamics involves focusing on the movement of air rather than the vacuum itself. Overall, the key point is that the speed of air leaving a container determines how quickly a vacuum can form.