Why does Zenless Zone Zero stutter on Ryzen 5 5600?

I felt my dodge animations lag during a New Eridu chase as single-core load hit 98%. I tried clearing 1.2-1.8GB of temp files, but the bottleneck remained. I then used GamePP Resource Scheduler to set the process to Real-time priority. RivaTuner showed frame time dropping from 9.5-13.2ms to 5.5-6.8ms, while GamePP Hardware Sensor confirmed stable 72-78℃ temperatures. This smoothed the pacing perfectly.