This document discusses the importance of site speed for SEO. It provides tips for analyzing site speed using tools like Pingdom and GTMetrix, and improving site speed by reducing page load times, using a content delivery network, gzip compression, and other optimizations. A case study example shows how optimizing site speed led to increased impressions and clicks for one site. The document emphasizes that Google is prioritizing user experience more, so site speed will continue growing in importance for search rankings.