ARKit FPS drop when device gets hot?

Question

Created Sep ’21

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During testing of my app the frames per second -- shown either in the Xcode debug navigator or ARView .showStatistics -- sometimes drops by half and stays down there.

This low FPS will continue even when I kill the app completely and restart.

However, after giving my phone a break, the fps returns to 60 fps.

Does ARKit automatically throttle down FPS when the device gets too hot?

If so, is there a signal my program can catch from ARKit or the OS that can tell me this is happening?

Answered by Graphics and Games Engineer in 686942022

Yes, this sounds like expected behavior. Since the device is hot and our phones don't have fans, the processor is not able to work optimally, leading to lower FPS. I'm not aware of any way to get the thermal/power state of your device, but others might know.

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Answer 1

Todd2 OP

Sep ’21

BTW, I am running the iOS 15 beta (19A5340a), and I am using RealityKit.

0

Answer 2

Graphics and Games Engineer OP

Apple

Sep ’21

Accepted Answer

Yes, this sounds like expected behavior. Since the device is hot and our phones don't have fans, the processor is not able to work optimally, leading to lower FPS. I'm not aware of any way to get the thermal/power state of your device, but others might know.

1