[odshoifsdhfs]

Did you find out what was causing it? I have developed 'heavier' (aka 50k lines of code) applications in SwiftUI on mac and it mostly sits idle (0-1% cpu based if it is doing some regular background stuff). Heck, I just created a quick Charts based app from an online example on Mac and stays at 0,0%.

Is it possible it is re-rendering the view hierarchy due to some data invalidation you haven't noticed?