Why does my FPS drop from 60 to 20 in dense areas of Night City?

Driving through the neon districts of Night City, my FPS would plummet from 60 to 20, making the experience feel terrible. I first tried lowering all graphics settings to Low, but the stutters from shader compilation remained, which felt like a futile effort. I used the GamePP Shader Compilation Queue Manager to limit compilation to 4 cores and cleared 4.2GB of redundant cache. Frame times converged to 16-22ms per RTSS, CPU usage dropped from 92-98% via GamePP, and temps hit 72-77℃ per HWMonitor.