For whatever it is worth, Notch has said that when Oculus initially approached him for Minecraft on the Oculus, he identified performance being an issue as the

For whatever it is worth, Notch has said that when Oculus initially approached him for Minecraft on the Oculus, he identified performance being an issue as the Oculus would require a steady 90fps, which Minecraft would struggle to provide on some hardware. He identified using Java as one of the reasons that this was the case. Before the Mojang/Oculus connection was severed in the Facebook/Oculus fallout, the plan was apparently to make a stripped down version of Minecraft, similar to Pocket or Pi, for the Oculus. (http://notch.net/2014/03/virtual-reality-is-going-to-change-the-world/)* http://notch.net/2014/03/virtual-reality-is-going-to-change-...