Why are map transitions taking 10 seconds in foggy areas?

Entering the fog-shrouded streets took ten seconds to load, which completely killed the tension and atmosphere of the game. I tried moving the virtual memory to another drive, but this only worsened I/O conflicts and increased frame drops, making me very anxious. I accessed the GamePP NVMe Queue Depth Configuration to increase the depth from 1024 to 2048 and enabled the write cache flush strategy. CrystalDiskMark showed 4K reads improved to 65-72MB/s, and scene transitions dropped to 3 seconds with a stable frame time of 5.1-6.4ms per In-game Analysis Tool.