Proton incorporates several libraries that improve 3D performance. These include Direct3D-to-Vulkan translation layers, namely D9VK for Direct3D 9, DXVK for Direct3D 10 and 11, and VKD3D for Direct3D 12. As of December 2019, D9VK has been merged into DXVK, which it was originally forked from.[6]