Set a timer. Show your homepage to a stranger. Take it away. If they can't tell you what you do, who you help, and what to do next, you just found out where all your traffic is disappearing to. Here's an uncomfortable fact about human attention spans: your website visitor has already half-decided whether to stay or leave before they've even finished loading the page. In the first five seconds or sometimes less. If your site can't communicate the basics in that window, it does