Have you performed this workaround for the Windows 11 22H2 performance issue. Uplifting to the latest Nvidia drivers and even beta geforce experience didn’t fix it for me.
Performing this workaround after each reboot however brought my performance back. Hope it helps. I have logged an Nvidia driver feedback form to see if they can clarify if a fix is coming from Nvidia side. I believe someone else has done the same on the Microsoft front.
Here’s the workaround steps.