How to fix CPU core scheduling jitter in TEKKEN 8?

I was attempting a 3A combo in TEKKEN 8 practice mode when the character lagged half a beat behind my keystrokes. This fatal microsecond delay broke my flow. I tried adjusting priority via system default settings, but it failed completely; background interference caused the frame rate to drop to 48 FPS. Using GamePP Resource Scheduler, I manually set the game process to Real-time priority and restricted background threads. GamePP Frame Time Analyzer confirmed 1% Low FPS improved to 55, with frame generation time converging from 12ms to 8ms.