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Steam actually shares compiled shaders between users with the same hardware / driver version, but only for Vulkan I believe.

The shared compiled shaders are only for the Steam Deck I believe. Other hardware will require a background compile or will compile at launch.

Nope, it's been available in the Steam client beta since 2016, and somewhere around 2017 it went into the mainline client.

Yes, it'll share a shader cache that isn't precompiled is what I mean. As opposed to the Steam Deck which shares precompiled shader caches.