One of the things I do to slow things down, is to plan with brutal honesty around how much a human can say, clearly, in a minute. And then assume that I’ll need 150% of that time. Have 20 minutes for a slideshow? Keep it at 4 slides - five minutes each - at 100 wpm, that’s 500 words each - but I’ll need to add more pauses in, so that’s 400 words each.

I try to do this already, and I just finish my slides in half the time sometimes. It isn't that I'm stuffing too much content - I just speak fast so it rushes through.