Why does FPS drop from 60 to 30 in Sword and Fairy 7 combat?

I was furious that my frames would plummet from 60 to 30 during peak action with heavy particle effects. I tried increasing the core offset frequency to force higher speeds, but the game crashed twice in ten minutes. I used the GamePP Load-Line Voltage Adjustment Wizard to set L3 mode and tuned the Vcore to 1.22V. Core frequency stabilized at 4.8GHz per CPU-Z, with CPU temps maintained at 70-75℃ per AIDA64 and Vcore at 1.22V per HWMonitor.