Why does MGSV stutter during combat on KingBank Black Lord?

Group combat in MGSV was unplayable with frame times spiking from 8ms to 42ms. I tried disabling the memory device in Device Manager, which fixed the frame time but killed my game capture. That was a frustrating dilemma. I used GamePP Peripheral Driver Conflict Detector to set the AMD driver background sync to Manual and enabled Hardware Encoding Priority in OBS. RivaTuner confirmed frame times stabilized in the 7-11ms range. OBS monitoring showed complete elimination of fluctuations. The game runs smoothly, and my recording setup is finally stable. No more random stutters ruining my clips.