Why does Nioh stutter during combat with ADATA ValueRAM 4GB?

I was hitting a wall with eerie micro-stutters during demon ambushes in Nioh, making precise parrying nearly impossible. I tried disabling all unnecessary Windows startup items, but available memory only increased by 120MB per GamePP Hardware Sensor, leaving the stuttering unresolved. I then used GamePP Resource Scheduler to set the game process to real-time priority and restricted background services to under 2%. RTSS confirmed frame time converged from 15-35ms to 10-14ms, with memory temperature stable at 42-47℃ per AIDA64.