A presentation is two performances at once: what you say and what the screen says. When they compete, the audience reads the screen — it is faster than you are. When they cooperate, the screen carries the evidence and you carry the meaning.
Slide discipline
Give each slide one job. If it is evidence, it needs a headline that states the conclusion, not the topic ("Costs fell 18%", not "Cost overview"). If it is a story beat, it needs almost no text at all. And the hardest slide discipline of all: the moment the slide appears, let it sit. You are not its narrator.
Your voice is the pacing layer
Audiences forgive imperfect slides; they never forgive being rushed. Practise with a timer and a target words-per-minute, mark your natural accelerations, and put deliberate pauses where you tend to gallop. Presentation Buddy's rehearsal mode exists for exactly this — teleprompter, pacing timer and breathing cues, free and offline.