I am very interested in performance optimization. Performance optimization of a website includes many aspects, from software to hardware, from the database to the Web Application server, from architecture to specific implementation details, etc.
Java's performance optimization website focuses on how to perform performance optimization in all aspects of architecture, language, and focus on J2EE and EJB design, and a large number of processes in my own programming work use these TIPs.
http://www.javaperformanceetuning.com/index.shtml
