Scenes in The Last of Us Part II Remake load incredibly slowly on my Colorful CVN. How do I find the cause?

Using stress report 04 on Windows 11 24H2, I put the system through a gauntlet. First, I ran a 3DMark CPU stress test; single-core clocks were okay at 4.8GHz - 5.1GHz, but the multi-core score took a weird dive around 13100. Then, CrystalDiskMark revealed the real culprit: random 4K read speeds were swinging wildly between 50MB/s - 65MB/s, way below what's advertised. The disk I/O just couldn't handle the bursts. I went into BIOS $ ightarrow$ Storage Configuration and swapped the NVMe protocol to 'High Performance' mode. After that, random reads jumped above 85MB/s. Loading is way faster now, but there's a catch: the VRM temps climb to 88℃ - 92℃ during long sessions, which triggers some slight CPU throttling. You definitely need more case airflow to keep this stable.