UE 5.4.0 is much slower than UE 5.3.2 on Mac Metal

I have a large terrain with heavy sculpting with very high areas, lots of meshes with some heavy materials, auto mat on terrain, and get 74fps average if I don’t go ‘auto’ . Its quite doable in 5.3, 5.4 same project, fps tanks to 24fps. ryzen 3 3600 rx 6600 8gb 16gb ram very fast m.2 hd.