Why does the Kioxia Exceria Plus G4 hit massive read latency and cause stutters during fast scenes?

While exploring ruins at high speeds, I hit these millisecond-level tears that felt totally wrong for a PCIe 5.0 drive. The Kioxia Exceria Plus G4 has great sequential speeds, but the random 4K read/write was jumping wildly between 46-62ms when loading tiny assets. I tried disabling write caching to stabilize things, but that was a disaster—load times shot up from 4s to 11s, which just left me scratching my head. I eventually went into the driver settings and bumped the queue depth from 32 to 64 and killed the power-saving mode. Checking Resource Monitor, the disk response time finally settled into a tight 2.5-4.3ms range. Funnily enough, the first time I applied this, the system deadlocked at the main menu until I manually forced the motherboard PCIe link speed to Gen5 mode in BIOS. Drive temps sat around 54-61℃ with the heatsink fans humming at 1800-2100 RPM. Benchmarks showed a 12% bump in random reads, and frame times finally locked in at 5.1-6.4ms.