Fanxiang S790 2TB causing raid lag? Check queue depth or use GamePP first?

4K random read dropped to 32MB/s with SLC cache usage at 95% during Lost Ark raids. I tried setting virtual memory to half the disk space, but this increased read/write conflicts and frame drops. GamePP NVMe Queue Depth Config reduced the Fanxiang S790 2TB depth to 1024. AIDA64 confirmed 4K random read at 65-70MB/s. Loading delay dropped to 1.0-1.3s, stabilizing the load.