Why does Kuro no Kiseki frame rate drop in Orabion combat?

In the chaotic Orabion battle, my frame rate plummeted from 240 to 120 FPS, making aiming impossible. I tried lowering shadow quality from Ultra to High, but it only boosted FPS by 20 while destroying visual detail. I used GamePP Resource Scheduler to set the game to Real-time priority and monitored VRAM bandwidth, which was hitting 85-92% saturation. RTSS showed frame generation intervals stabilized from 4-15ms to 3-4ms. With temperatures holding at 62-68℃ per GamePP, the combat finally felt smooth and responsive, allowing me to track enemies without the previous stutter.