Why does Nioh 2 have irregular frame drops during boss fights?

I felt completely cheated during a fast-paced boss fight when a sudden frame drop ruined my parry timing; HWiNFO showed voltage swings between 1.35-1.38V. I attempted to increase my virtual memory to 32GB, but it didn't stop the drops and actually made my whole system feel sluggish. I then used the GamePP BIOS Load-Line Voltage Guide to lock my memory voltage at 1.40V and SoC at 1.2V. The result was instant; latency stabilized at 62-66ns per AIDA64, and MemTest86 confirmed zero errors over 6 passes with temps at 58-64℃.