Why do textures vanish when driving fast in GTA V with Intel 660P?

I was driving fast through Los Santos when buildings suddenly turned low-poly or vanished, creating jarring map holes that ruined my RP immersion. I tried disabling the write cache in Windows, but that was a mistake; it just increased loading times by 30% and solved nothing. I then used GamePP NVMe Queue Depth Configuration to force the queue depth from 32 to 128 and set the game to high priority. GamePP Hardware Sensor showed random read speeds jumped to 310-350MB/s, and AIDA64 confirmed SSD temps stayed at 42-48℃.