As you begin to think about your audience, consider their individual roles and experience. Are they likely to already have foundational knowledge in UX design and the process? If not, you’ll want to make sure you’re not using any UX-specific jargon unless you’re planning on providing a brief definition or explanation along with it. This will also help reduce the number of questions at the end that stray away from the core topic of the presentation.
To this point above, in my experience I have often spent any amount of time going over personas, research, problems and our approach as comprehensively as I can, and have often lost my audience who are unable to connect the dots especially with format like wireframes.
So I am now presenting more and more hi-fidelity prototypes so user can follow the story and relate to how it will be unravelled in the product's design and experience.
Last but not the least, I keep in my arsenal a 2-minute video teaser of how the app/website will work with music, voiceover and animations to often end the meeting with a round of applause and standing ovation!