I have exactly the same issue. Sonoma 14.7 + MBP M3 Max. I loaded an Act 3 save game (saved with Patch 6 of course). I quit the game multiple times, re-enabled High-Power mode on the Mac. Still choppy. Using the Metal HUD I see FPS capping at 45fps, whereas it was hitting 60fps before. Also the GPU + fans clearly do not hit the max speed.