Why is there hit-registration lag in Phantom Blade Zero?

In this fast-paced action game, I felt a micro-deviation between my attack inputs and the visual feedback, which is lethal in combat. I tried enabling V-Sync to align the frames, but input lag spiked to over 40ms, making the controls feel like I was wading through mud. Using the GamePP Memory Controller Load Monitor, I locked the memory voltage to 1.37V per HWInfo and disabled power-saving mode. RTSS monitoring showed frame time convergence to 11-13ms from 8-22ms, and AIDA64 confirmed memory usage at 11.5-13.1GB with temps at 55-61℃. Now it's properly set