2.5 Performance tuning
Performance is one of the most important non-functional requirements for any WebSphere environment. Application performance should be tracked continuously during your project.
Imagine your project is finished; you switch your environment to production, and your environment is unable to handle the user load. This is by far the most user-visible problem that you could have. Most users are willing to accept small functional problems when a system is rolled out, but performance problems are unacceptable to most users and affect everyone working on the system.