Performance Faq   

• WhenToOptimize
• PerformanceOfGarbageCollection
• CachingStrategies
• EnterprisePerformance - Best practices for Java tuning
• InvestigateOutOfMemoryError - Strategies for solving this most vexing problem

There is a web site dedicated to topics related to Java performance: http://www.javaperformancetuning.com/

Java Platform Performance: Strategies and Tactics = This book covers every aspect of Java performance, including speed, scalability, RAM footprint, startup time, and user-perceived performance factors.