Microsoft has revealed how developers can use Direct3D 11 to unlock the full performance potential of the Xbox One. They have mentioned that “developers creating content for the system are able to use the same programing constructs across Windows and Xbox, and benefit from all the improvements that have been introduced on Windows.”
With Xbox One we have also made significant enhancements to the implementation of Direct3D 11, especially in the area of runtime overhead. The result is a very streamlined, “close to metal” level of runtime performance. In conjunction with the third generation PIX performance tool for Xbox One, developers can use Direct3D 11 to unlock the full performance potential of the console.
Here’s some of the improvements to Direct3D 11 for Windows and presumably it should apply for Xbox One as well.
They have also mentioned that they are “continually innovating in areas of performance, functionality and debug and performance tooling for Xbox One.”
Source – Microsoft