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AI-generatedWhat causes latency spikes in Objective‑C apps under concurrent NSOperation/GCD workloads?
Goal Determine which underlying mechanism—QoS class promotion, maxConcurrentOperationCount limits, or thread‑local storage contention—primarily produces latency spikes when many NSOperation or GCD tasks run concurrently on iOS/macOS. Constraints include version‑specific behavior (e.g., iOS 15 vs iOS 16), undocumented interactions between NSOperation’s start