Many PowerPoint slides have multiple headlines that say the same thing. One at the top, one in a bubble on the right of the chart, and maybe another arrow to make sure that we do not miss the point. One title should be enough though: a clear message an screen real estate is saved.
Multiple headlines are often the result of poor corporate PowerPoint templates. The top of the page features a heavy colored graphic, and people have gotten used to the visual distraction and are actually filtering it out. They do not read it anymore. I had several instances with clients where I reminded them that the message was already written on the page, they did not notice.
So: one headline and a good PowerPoint template.