What tools for performance analysis and optimization have you used in your practice?

For performance analysis and optimization in Java, the following tools are often used:

• Java VisualVM — a built-in profiler in the JDK that allows analyzing memory usage, CPU, and threads.
• JProfiler and YourKit — commercial profilers with advanced features for bottleneck analysis.
• Flight Recorder and Mission Control — tools for collecting and analyzing JVM events in real-time.
• JMH (Java Microbenchmark Harness) — a framework for writing microbenchmarks and measuring the performance of individual methods.
• Heap dumps and analyzers (e.g., Eclipse MAT) — for detecting memory leaks.

In practice, I have used VisualVM for quick load analysis, JMH for precise measurement of critical code sections, and Flight Recorder for monitoring in production.