Why is my frame time fluctuating so wildly in Red Dead Redemption 2 4K MOD?

During intense group combat in RDR2 4K MOD, my frame generation time was jumping from 8ms to 45ms. It was a stuttering nightmare that ruined every critical moment. I tried disabling the camera device in Device Manager, which stabilized the frames but killed my live stream. That wasn't an option. I used the GamePP Peripheral Driver Conflict Detector to identify the issue. I set Razer Synapse to manual start and enabled hardware encoding priority in OBS. RivaTuner confirmed the frame times stabilized in the 7-12ms range. Task Manager showed CPU usage maintained at 65-72%.