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GPU access to staging textures is limited to CopySubresourceRegion and CopyResource, so if the texture uses a buffer for mapping we can also copy to that in those methods. This removes the need to sync with the GPU when the texture gets mapped.
There's a caveat: This only works for textures with a single subresource because there's only one mapped buffer.
This improves GPU utilization in The Surge by 20-40% (its >95% now for me). Performance is improved by similar numbers.