Why does FF7 Rebirth stutter during intense combat scenes?

Combat in FF7 Rebirth felt unresponsive with frame times jumping to 45ms. I tried disabling RAM in Device Manager, but it broke disk access. I used the GamePP Peripheral Driver Conflict Detector to set the sync service to manual start and enabled hardware encoding. RivaTuner showed stable 7-12ms intervals, and Task Manager confirmed CPU usage stayed at 65-72%. This set of changes restores fluid action.