Its a pretty hefty performance impact from using Shadowmask and a mixed mode directional light even without any dynamic objects in the scene.
Here with dir light
625 set pas calls, around 4-4.5 ms CPU frame time
Here without the mixed light
211 set pass calls and around 3ms CPU frame time. Pretty huge difference.
Are there any tricks you guys can share to optimize for shadowmask mode with a mixed mode dir light? Im on forward render path. This is with single pass enabled, will move to single pass instanced as soon as possible. It only affects batrches (draw calls) however