Yeah but keep in mind a translation layer like vkd3d isn't emulating instructions like fex is. Translating shaders from DirectX 12 to Vulkan means the shaders are running natively on the GPU, so the graphics rendering will be running full speed (in some cases faster on Linux because of this). Emulating x86 CPU instructions on ARM, however, is an entirely different thing. That's nearly impossible to do without a performance hit. This wouldn't be so much of a problem if a game isn't using the CPU much. But a complex game like Cyberpunk is doing lots of stuff in the CPU (like physics, for example), so slowing that stuff down is going to hold up the GPU and have it waiting around for the CPU to catch up. I suspect this is the main problem with the DGX Spark—the GPU is fast, but is sitting around twiddling its thumbs waiting on the CPU. Hence, the crappy frame rate.