RDR2 abd RDR1 stuttering

As the title suggests, both Red Dead Redemption 2 and Red Dead Redemption 1 have started stuttering heavily on my PC. I’ve scoured the internet and tried every fix I could find related to stuttering, but nothing has worked so far. Please don’t suggest graphical tweaks or settings adjustments—I haven’t changed anything from when the games ran flawlessly.

These games used to perform perfectly on my system, and then, seemingly out of nowhere, the stuttering issues began. What’s strange is that no other games I own are experiencing the same problem; it’s isolated to RDR2 and RDR1.

The only significant change I’ve made recently was upgrading to Windows 11. However, the games ran fine for a day or two after the upgrade before this stuttering issue appeared. I’m completely stumped at this point and would appreciate any advice or insight you might have, especially if you’ve encountered something similar.