Embodiments of a web page optimization system are described. The system utilizes an accumulated body of visitor data regarding interaction with one or more web pages to determine an optimized web page to display to a visitor. Various types of session data, including network traffic data for the client computer, demographic information about the visitor, and general and specific session data of other visitors in similar browsing sessions are defined and compiled. Continuous full-path optimization from initial visitor interaction with the web page is provided through a visitor context analysis component that analyzes certain parameters related to how the visitor has accessed the web page. A real-time web page optimizer component introduces variations in one or more features of a web page to create a new web page, conducts structured tests of the new web page, compares the performance of the web page with one or more known served web pages and removes from presentation eligibility those pages with inferior performance. This facilitates real-time decision making of which web page to serve to a visitor based on an accumulated visitor context. It further allows the authoring of web pages that are optimized with respect to eliciting a desired user interaction with the web page.