Bleeping Computer said that reports of issues surfaced last week and the problem appeared to be caused by large fluctuations in CPU usage resulting in stuttering and lag were numerous. Initially, everyone blamed Microsoft because the issues were gone after rolling back to the previous Windows version.

However,  Nvidia staff member Manuel posted on one forum that Windows 11 22H2 added new graphics debugging tools which were inadvertently getting triggered and this is leading to some users to see lower performance in games. 

That fix is now available. Nvidia posted an article on its support site directing users to either download GeForce Experience 3.26 beta or update from within the GeForce experience app itself, though to do so, you need to go to the app settings and ‘enable experimental features’ which gives permission to install the beta version.

The fact that Nvidia fixed it so quickly was probably a sign that the issue was not a biggie.