Why does Final Fantasy XV stutter during intense group combat?

Group combat in FFXV had severe frame time jumps from 8ms to 45ms, which was frustrating. I tried disabling the CPU in Device Manager, but system performance dropped. I used GamePP Peripheral Driver Conflict Detector to set Intel DTT service to Manual. RivaTuner showed the frame time stabilizing at 7-12ms, and CPU usage remained efficient at 65-72%, ensuring smooth gameplay.