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Bit idea : The Witcher 3 written in assembly with 40 billion lines of code so you can run it on an old windows 98 desktop
(hexbear.net)
I don’t wanna any nerds in here explaining why this is impossible I choose to believe it could be done in theory
I was imagining something that looks and plays almost exactly like Witcher 3 except at lower resolution, which doesn't seem possible to me. I'd say if you simplify the graphics (replace dynamic lighting with pre-baked lightmaps, do gouraud shading instead of PBR, remove most post-processing effects etc etc) and make all models look like half-life assets, you could definitely render something at an acceptable frame rate. However asset streaming would still be a huge issue for a large and detailed open world like Witcher 3, considering memory limits and slow disk reads