Why is there random stuttering in Monster Hunter: World?

Every trigger pull caused a stutter that drove me insane. I uninstalled background apps, but accidentally broke a driver. I used the GamePP Peripheral Driver Conflict Detection Tool to disable a camera sync service hogging the I/O bus. RivaTuner confirmed frame time dropped from 8-12ms to a steady 5-6ms. Core temperature stayed at 58-64℃ per GamePP sensors. The lag is gone, and my aiming feels precise again.