Unity yesterday announced support for DirectX 12 on Xbox One. This DirectX 12 support is available with Unity 2018.3 and it will bring performance improvements by reducing driver overhead, better use of multi-core systems and more.
DirectX 12 on Xbox One brings with it Unity’s new Native Graphics Jobs, which also contributes a significant CPU performance improvement. Alongside these performance benefits, DirectX 12 also brings support for new rendering techniques in Unity, starting with Async Compute, which is available with DirectX 12 on Xbox One out of the box.
Even though Unity will continue to support DirectX 11, Unity announced that it will make DirectX 12 the default for all new projects.