How do I stop frame rate fluctuation during Hitman 3 stealth scenes?

Every perspective switch in stealth caused the screen to jitter, dropping from 60 to 48 FPS per RTSS. I tried lowering graphics quality, which stabilized FPS but ruined the visuals, causing me anxiety. I used the GamePP Resource Scheduler to raise the process priority to real-time and adjusted thread affinity. The GamePP Frame Time Analyzer showed generation times converging, and Process Explorer confirmed stable CPU usage. The 48-60 FPS fluctuation is gone, setting a consistent performance baseline.