What's the biggest presentation mistake that kills investor pitches?

The biggest mistake I see founders make is cramming too much information onto every slide. Investors don't read dense paragraphs during pitches. They scan visuals and listen to your story. When I couldn't land meetings, I worked with a presentation designer uk who cut my deck from 35 slides to 10 focused ones. Each slide had one clear point with supporting visuals. I raised £2M within six weeks. Less content, better design, clearer story wins every time.