On my computer it's still running at full speed. But I heard about frame drops from users, and I think it might be related. Also it's an app that constantly runs in the background so it should be as efficient as possible to conserve battery etc.

Thanks for chiming in! I am using GDC pretty heavily. If I can do anything to help get to the bottom of this, please let me know.

I searched my project source and there is nothing on my end that is calling dispatch_introspection_hooks_install. I don't think I ever heard about dispatch introspection before today, so I don't think I wrote any code that interacts with it. I also played around some more with the CPU profiler and it looks like almost everything just takes way more CPU cycles when the app isn't launched by Xcode debugger. I'm not totally sure if I'm reading the stuff right.

Nope I'm on ARM, also not running through Rosetta or anything