Often when I launch a game through Steam that “processing Vulkan shaders” window appears and loads for a couple minutes. Sometimes it takes no time, sometimes it takes several minutes. But then, for larger games like Dune Awakening or Outer Worlds 2, the game needs to sit and process shaders for another couple minutes anyway. But for some games, like Enshrouded, I can skip the Vulkan processing with no problems in the game (I do that because the Vulkan processing doesn’t go anywhere). So what is that Vulkan processing for?
There is a better way. Instead of compiling when you launch the game, you can enable background processing of shaders. This will happen while you’re not gaming. If you don’t do other stuff on that computer while you’re not gaming and it is turned off or asleep instead, it might not help.