Why does my FPS drop from 60 to 20 during combat in Remnant II?

In the chaotic battles of Remnant II, releasing large-scale skills caused my FPS to tank from 60 to 20, ruining my timing. I naturally assumed it was a GPU driver issue and spent an entire afternoon reinstalling drivers three times, but the drops didn't stop. Using the GamePP BIOS Load-Line Voltage Adjustment Wizard, I spotted a 0.08-0.15V drop via Multimeter. After a failed attempt to lock voltage at 1.3V which caused a BSOD, I switched to Medium mode with a +0.02V Vcore offset. Cinebench tests then showed core frequency stabilized at 3.8-4.0 GHz per CPU-Z, and the stutters finally vanished.