How do I stop write speed drops to 800MB/s in Remnant II with Corsair Vengeance DDR5?

Loading fragmented scenes in Remnant II was painful. My SLC cache filled up, and write speed crashed from 4000MB/s to 800MB/s. I tried setting queue depth to 512, but latency stayed high. It didn't help. I used the GamePP NVMe Queue Depth Configuration to lock the depth to 1024. CrystalDiskMark showed write speed recovered to 3800MB/s. Drive temperature remained stable at 45-50°C. This configuration export solved the loading lag.