How macOS controls performance: QoS on Intel and M1 processors (2022)
Summary
This article explains Quality of Service (QoS) in macOS, showing how processes are scheduled on E (efficient) cores and P (performance) cores across Intel and Apple Silicon Macs. It provides measured data for compression/decompression speeds at high vs low QoS and discusses the practical implications for battery life, performance, and developer control, noting the rarity of user-exposed QoS settings.