Just to link back from here that this maybe also affects dotnet MAUI still: https://github.com/dotnet/maui/issues/26650 And that also the separator reappears when the window is moved - even if it has been set to hidden: https://feedbackassistant.apple.com/feedback/18161892

Oh wow, the battery life on a MacBook is absolutely terrible on video capture apps because of this. Did anyone find a way to disable it yet?

@AvdLee If you're concerned about AVFoundation perf, maybe you'd like to boost and comment on this issue: https://developer.apple.com/forums/thread/743518 AVFoundation uses nearly 50% CPU by default because of Reactions, and there's apparently no way to turn it off!

@Jang-Soonwon By default, Apple applies Reactions and there's no way to turn it off. So, this could potentially related: https://developer.apple.com/forums/thread/743518

Unfortunately, even meddling with the relevant user plist files doesn't seem to be sufficient to turn it off... group.com.apple.secure-control-center-preferences.av.plist If the application's reactions-enabled and gestures-enabled-default are set to false, the high CPU usage from the gesture recognition is still incurred.

Similarly, I'd like to control things like the exposure and power-line frequency on UVC cameras

This is reproducible with Apple's own tutorial project: https://developer.apple.com/tutorials/sample-apps/capturingphotos-camerapreview 85% CPU usage on an M2 Pro with a Catalyst build! Even if you don't do any processing in the ouput delegate, then the CPU usage is still really really high! I measure the battery life for video capture as about 7 times better on a similarly specced Windows machine.

One more post from some further investigation... I find the problem appears to be Catalyst specific. Running the same AVFoundation video capture code for macOS uses roughly 5x less CPU than the same thing in Catalyst.