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Performance Logging (Developer settings) logs a resource sample every 5s in the foreground and background: CPU by area and thread, wakeups, GPU, memory, disk, activity counters as rates (mpv property updates, player time publishes, renders, saves, network, images, CloudKit events, log entries, main run-loop wakeups), SwiftUI body evaluations of the player views, and app/player/battery context. Each foreground/background transition logs a summary of the period. MetricKit metrics and diagnostics (CPU exceptions, hangs) are logged whenever logging is on. Background diagnostics (iOS) log lifecycle, audio session and power events with an app/player/render snapshot and a heartbeat that detects suspension gaps and main-thread stalls. Logs are persisted per session in Caches/Logs and the previous session is included in exports, so logs survive the app being swiped away.