How do I fix the 18-35ms stuttering during stealth transitions?

During stealth infiltrations, the screen would suddenly stutter as CPU threads jumped violently between cores, causing frame times to swing between 18-35ms. I tried enabling Extreme Performance mode in the BIOS; while I gained 5 FPS, the CPU temp spiked to 92℃, making me eager for a software fix. I used the GamePP Resource Scheduler to set the game priority to real-time and locked core frequencies. RTSS confirmed frame times converged to 12-16ms, and HWInfo64 showed CPU temps at 68-75℃.