This document discusses the importance of customer experience and web performance monitoring from a complete perspective. It notes that web analytics can provide "hard data" on what users do on a site, usability testing can show how users interact with a site, and performance monitoring can indicate if users can complete desired tasks. A holistic view is needed to understand user behavior, motivations, community sentiment, and competitors. The document argues that optimizing website performance through techniques like acceleration can significantly improve key metrics like conversion rates, time on site, bounce rates, and revenue. It notes performance impacts will vary across users and more data is needed to map the relationship between latency and business outcomes for a given site.