Why does Hitman 3 drop to 40 FPS in complex scenes with my RAM?

Complex scenes dropped my frame rate from 60 to 40 FPS, causing severe stuttering. I tried closing background apps, but the memory usage remained high, making the fix superficial. I used GamePP Memory Controller Load Monitoring, which showed usage at 95-98%, and expanded to 16GB dual-channel. 3DMark confirmed the frame rate recovered to 55 FPS, and AIDA64 showed memory stable at 49℃, verifying the upgrade.