Why does Tales of Arise stutter during multiplayer attacks?

I felt totally defeated when my frame rate plummeted from 90 to 45 FPS during multiplayer combined attacks, completely ruining the combat rhythm. I initially tried lowering the CPU voltage in the BIOS; while temps dropped by 5℃, my system suffered random reboots during map loading. I then used the GamePP Fan Curve Configuration Panel to lock the pump speed at 100% and set radiator fans to 90% at 70℃. Core temperatures converged to 65-72℃ per AIDA64, and frame times stabilized at 11-16ms per RTSS, with VRM temps at 52-58℃ per HWiNFO64.