What Happens When You Max Out an iPhone: Thermal Throttling in Real-Time AR

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How thermal throttling silently breaks real-time AR on iOS, why ProcessInfo.thermalState matters, and the graceful-degradation ladder I built to handle it.
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Run ARKit, LiDAR, Metal, and a background upload at the same time and an iPhone gets hot. When it does, iOS quietly throttles the GPU, drops your frame rate, and degrades AR tracking with no crash and no error. Here is how thermal pressure actually breaks a real-time AR app, why ProcessInfo.thermalState is the only honest signal you get, and the degradation ladder I built so the app slows down on purpose instead of falling apart.