Speaking to fast during your presentation will make it more difficult for your audience to follow you. Speaking too slow and you have the risk that you start to sound boring. Most people tend to
speak too fast. Feeling nervous and the adrenaline in your body may cause this.
How do you know that you speak too fast? One of the things that you can do is asking specific feedback when you practice your presentation for someone. You can also ask feedback to a trusted
member of your audience after the presentation and use this feedback for your next presentation.
Read tips and tricks about the best use of your voice in the book Public Speaking
Excellence.