Hi.
To keep it short, I documented the performance loss Source Engine 1 games experience when they can’t use DirectX directly to render (yes, even Vulkan on Windows 10, DXVK, gives the same results).
The complete post I made is on Reddit because, of course, this is also not a Fedora-only problem
The backup will need to be reuploaded (it seems bugged, maybe I should’ve waited a couple minutes more):