Why is my FPS low in cities despite having a Radeon RX 9070 XT?

It was ridiculous; with a powerful 9070 XT, my frames dropped to 30 in the city while the GPU was basically idling. I tried enabling XMP memory overclocking in the BIOS, but the city frame rate only shifted by 2 FPS, which felt like a joke. I used the GamePP Resource Scheduler to reassign CPU affinity away from Core 0 and bumped the process priority to High. RTSS showed frame time fluctuations dropped from 33-50ms to 22-28ms, AIDA64 measured 52-56℃, and GPU-Z showed a low GPU load of 38-42%. Finally playable.