How to fix unstable FPS when walking in Novigrad city?

Walking the busy streets of Novigrad, the frame rate fluctuated wildly between 40 and 65 FPS, which was incredibly annoying. I tried disabling all next-gen effects; while the FPS stabilized, the visual loss was severe, and I was very dissatisfied. I then used the GamePP Resource Scheduler to set the game to Realtime priority and lowered background task priority. Frame time converged to 13-18ms per RTSS, and VRM temperature remained at 60-66℃ per AIDA64, making urban exploration smooth.