“APM not equal” explores the multifaceted world of performance analysis, highlighting pioneers like Gene Amdahl and leading companies like Intel and IBM. Essential software tools like Intel VTune Amplifier, ARM Performance Analyzer, and Perf empower developers to identify and address performance bottlenecks. Fundamental concepts such as Amdahl’s Law, Gustafson’s Law, and memory bandwidth provide a theoretical foundation for optimization. Key aspects like high-performance computing, scalability, and parallel programming are examined, equipping readers with strategies and techniques to enhance performance in modern computing systems.