Why is Dying Light 2 stuttering with Asgard Bragi II DDR5?

Sprinting through Villedor, the game stuttered every time I turned, making the parkour feel disjointed and clunky. I tried enabling Windows Game Mode, but the stuttering actually increased, which made me feel extremely anxious. I used the GamePP Memory Controller Load Monitor to lock the frequency from 6800MHz down to 6600MHz. RTSS showed frame times dropped from 12-28ms to 9-13ms, and AIDA64 confirmed memory temps stayed at 55-61℃. The flow is finally back.