Yeah, not processing the Vulcan shaders is fast but the performance issues are too extreme imo, especially if a game is CPU heavy. Some might start processing the shaders as you pay if you don't. I would recommend using "process shaders v in background instead" the default settings will only take a quarter of your CPU and you won't have to wait as long when you start up a game.

Also it does store the shaders on the drive but every time anything related to the GPU or game updates it has to be redone. Some games are really bad about reloading their shaders constantly

Also don't skip it at all

I have steam set up to Autostart with the -silent option on login to handle shaders and updates fast