Tuning WebSphere Application Server is essential for optimal utilization of the middleware infrastructure. WebSphere Application Server Performance Tuning toolkit can be easily used to detect performance bottlenecks and tune WebSphere Application Server infrastructure. It provides various easy to use and configurable features which eases problem determination. This part of the tutorial explained the features, advantages and briefly explained the various components of PTT, taking a sample performance issue and then using PTT to resolve the issue. Part 2 of the tutorial shows how PTT can be used in other scenarios.