Why does Elden Ring stutter during open-world exploration?

Exploring Elden Ring, I noticed FPS dropping from 60 to 45. Overclocking to 3600MHz caused a blue screen. Using GamePP Memory Monitor, I identified the bottleneck. I switched to High Performance and set frequency to 3466MHz. AIDA64 confirmed temperature at 55-60℃ and frame rate stabilizing at 58-62 FPS.