The phrase "rapid pace" refers to a speed that is fast or quick. It indicates something happening at a very high velocity, with little time in between each event or action. The term can be used to describe anything from an individual's movements (such as running or walking quickly) to the progress of a project or development (such as technological advancements or economic growth). In general, "rapid pace" suggests that something is happening with great speed and efficiency, often leaving others behind.