The issue is in Xcode when a preview is done in a SwiftUI view : CMD-OPTION-Enter. The Mac starts to heat and many CPU cores are fully used. The profiles you give are for real devices, whereas the issue is inside Xcode with the integrated iOS preview without any device connected. Could you please give updated steps in order to allow the sysdiagnose to be created ? Thank you.

Same issue with iOS 18.3 and Xcode version 16.2 (16C5032a) Bug report ID: FB16449802 It does work on iOS 17.5 in the simulator, but not in OS 18.2 and 18.3 Thank you

Thank you. It does work on iOS 18.2