How to fix severe FPS drops from 50 to 15 in Avowed forests?

Exploring fantasy forests, fast camera movements caused frames to crash from 50 to 15 per RTSS, which is a disaster in combat. I tried increasing virtual memory to 32GB; it stopped the crashes, but the stuttering frequency actually increased, which made me furious. I used the GamePP Resource Scheduler to set game priority to Realtime and cleared redundant VRAM. CPU-Z confirms VRAM frequency is stable at 8000MHz and HWMonitor shows core temps at 72-80℃.