It is impossible for the audience to read and listen at the same time. A person can task switch, but cannot multitask, therefore if they are reading your slides, they are not listening to you. Vision is one of our most important senses. It is a well-known fact that the a significant portion of our brain is wired for vision, therefore, try to find a single image that encompasses the main message of your slide, then use your actual voice to fill in the blanks. It takes our brains longer to process text-based information than it does visual information.
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