Why does Kuro no Kiseki II stutter in urban environments?

Walking through city streets, the screen would freeze for 0.2s, which is devastating during fast combat. I tried lowering texture quality in-game; I gained 5 FPS, but the visuals suffered so much it felt like a step backward. I used the GamePP Image Sampling Calibrator to switch DLSS mode to Balanced and set sharpening to 65. GPU-Z now shows core temps suppressed to 74-78℃ and CPU-Z confirms a stable frequency around 2550MHz.