Counter-example so you know it is not universal: mine is text-heavy and motion made it unreadable, because the interesting part is words on screen and six seconds is not long enough to read them. An annotated static screenshot with one arrow and one short label won clearly.
Whatever you do, show it to five strangers and ask them what the product does before they scroll. At 900 visits a month that is a better instrument than any test you can run.