Practice your presentation in a dim, soundproof room. Forget your notes and slides. Walk around. Pace. Visualize being on stage. Feel the momentum building up inside of you. Use your vocal range. Use your body.

Go through your talk. Then do it again. And again. And again.

Always visualize being on that stage. Always move. If you do that, you'll find the pace that is right for you and, in turn, for your audience.