How do I fix combat stutter in Phantom Brigade on DDR5?

Summoning units in Phantom Brigade caused instant stutters as the SLC cache overflowed. I tried setting virtual memory to half the disk space, but it worsened the read/write conflicts. I used GamePP NVMe Queue Depth Config to increase depth from 1024 to 2048 and enabled forced write cache flush. CrystalDiskMark showed 4K random read improved from 45-52MB/s to 68-75MB/s, and load times dropped from 12s to 5s.