Mainly, i search and focus the topics below
PERFORMANCE TESTING: Defining performance and performance tuning, Defining the user experience, Psychology of performance tuning, Performance tuning methodology, Performance tuning model, System monitoring, Response time budgeting, Usage patterns, Test harnesses, Load, stress, and endurance testing, Micro and macro benchmarking, Analysis of benchmarking results, Factors that affect benchmarks
ALL ABOUT THE JVM: HotSpot internals, HotSpot monitoring, HotSpot tools, HotSpot tuning, Memory management, Garbage collection basics, Garbage collection algorithms, Object Lifecycle, Monitoring garbage collection, Tools for garbage collection analysis, HotSpot and Garbage collection exercises
PUTTING IT ALL TOGETHER: Tools to find latency, JDBC monitoring, Java Management eXtentions (JMX), Thread profiling, Execution profiling, Thread monitoring, Memory profiling, Memory leak and loitering objects