Stop pushing the complete text of your presentation into your slides.
From John Sweller at the University of NSW, Sydney, Australia:
“It is effective to speak to a diagram, because it presents information in a different form. But it is not effective to speak the same words that are written, because it is putting too much load on the mind and decreases your ability to understand what is being presented.”
You’d think everyone could sing along with this by now, but there are still too many bullet points out in the world of PowerPoint.