iPhone X overheating with AVCaptureVideoDataOutput

My iPhone X easily overheats within 30 seconds when using AVCaptureSession with AVCaptureSessionPreset3840x2160. No processing is done except displaying frames using GLSL shader on the screen like in RosyWriter. Is this a known issue or an issue with my device? I am using iOS 11.2 beta 3 but the issue was seen with previous betas too.

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I restored my iPhoneX to iOS 11.1.2 and the iPhone is still overheating on the backside near camera. All I have is AVCaptureSession with 2160p preset and GLView that renders the plain frames.

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@Apple Engineers, Using 3840x2160 preset @60 fps using AVCaptureVideoDataOutput is causing iPhone X to heatup even in iOS 11.3 beta 3. Though heatup may be slightly less compared to iOS 11.2 but it's there. Is this a known issue which you are working on?

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