https://www.phoronix.com/scan.php?page=news_item&px=SteamPlay-Proton-4.11-3, articles a little old but figured it was worth posting. With this addition to proton, steam is now capable launching directx 9 games using Vulkan, greatly reducing cpu overhead, when running games via wine(proton). Ive given a few games a try and so far so good, it seems less buggy than the native wine ogl to directx translation. performance is pretty good considering how immature the d9vk project is. This essentially completes directx to vulkan support, now 9-12 is supported with reduced overhead.