

Technically it’s everything it’s any steam game. It’s a community resource.
It doesn’t always work, sometimes it makes things worse, some times it helps.
It’s a real crap shoot.
And if you play a lot of games it can be a LOT of storage space. For example my shader precache right now is 90gigs. Cause I play a bunch of different games so every game has to have it all saved.
Compiling at run time or during game play means those shaders only use ram for the duration of the game instead of physical storage space on top of ram during game play.
It’s all systems but only for vulkan. So outside of Linux it’s not used much since most windows games are direct X not Vulkan.
And even then some games use both so while you have the Vulkan shaders you still may need to compile direct X shaders.