Why does the WD Black SN750 SE cause frame drops?

Combat in Gears 5 was unplayable. Frame times spiked to 45ms (RivaTuner) due to sync service conflict. I disabled the disk in Device Manager, but it broke system access. I used GamePP Peripheral Driver Conflict Detector to set the service to Manual. RivaTuner showed 7-12ms intervals. OBS confirmed 65-72% CPU usage. The game runs smooth now. These settings are a must.