The preacher should vary the sermon pace.  The sermon pace should change and not be monotonous.  This will certainly serve the audience better.  When the sermon is consistently too slow, it becomes an endless droning with no impact.  When the sermon is consistently too fast, the audience gets frustrated after a while.  Since the audience may not be able to keep up with the sermon, three things could happen.

First, the highly motivated audience would try very hard to keep up.  As a result, the audience only has time to absorb, but no time to think, thus bypassing the necessary intellectual listening process.

The second result of a fast-pace sermon is that the unmotivated audience quickly tunes out the preacher, thus wasting both the time of the preacher and audience.   An evenly paced sermon, whether it is too fast or too slow, tends to distract rather than inspire.

The third result of a fast-pace sermon is the mixture of words.  Preachers who speak consistently too fast and at such an evan fast pace would eventually hit a point of fatigue past mid-way. Then, the preacher would start jumbling the words together.  This is never great for clarity.

What solutions do I offer my students?  First, listen to your own sermons and count how many words you would get in a minute.  IF you get over 120 words per minute, you’re too fast.  Second, you also need to vary your pace.  If every second averages about two words, then you may want to speed up certain parts to three and slow certain parts down to one with a pause here and there.  Reread the manuscript with fast and slow pace at places and see how it feels. Do this on your day off and see if you can improve using the word-count method to guide.