Why does my frame rate drop to 45 FPS during group combat in Wuthering Waves?

Dropping from 60 to 45 FPS in fights was unacceptable. I tried increasing the page file, but it made stutter worse. I used GamePP NVMe Queue Depth Configuration to increase depth from 512 to 1024. Sequential read hit 5300MB/s per CrystalDiskMark. Frame time stabilized at 5.1-6.4ms. I verified the fix.