That's cool. One should always been trying to improve your performance. Optimization can really change dramatically, just like any launch games, then the graphics at the end of the gen. It almost seems like magic. But when you can make one change that improves something 10%, but that is multiplied exponentially, it's dramatic.
Plus they will need more graphic people fro the new HoloLens. Which is no longer an Xbox product, but a Windows one.