Why do I experience stutters during TEKKEN 8 combos?

At the moment of executing a high-frequency combo, the screen suddenly had a slight stutter, which is fatal in a fighting game. I tried enabling write cache flushing in the driver; while loading speed improved by 1 second, the frequency of frame drops actually increased. I used the GamePP NVMe Queue Depth Config to lock the depth at 256 and set the process priority to Realtime. Frame generation time converged from 22-35ms to 11-15ms per RTSS, and fan speed stabilized at 1400-1600RPM.