I was just looking at r.ForwardBasePassSort, and I think the description doesn’t match the functionality, which could lead to some confusion. The description states:
0: Decide automatically based on the hardware.
1: Sort drawing policies.
2: Sort drawing policies and the meshes within them.
However, when, you look at EBasePassSort, you see:
0: Auto
1: None
2: SortStateBuckets
3: SortPerMesh