Retro gamers have managed to get the popular emulator frontend Retro Arch installed on the Xbox Series S and Series X consoles. Not surprisingly, performance is excellent, but considering the frontend's limitations of previous consoles, the retro gaming capabilities of Microsoft's new gaming machines are impressive.
https://www.notebookcheck.net/The-Xbox-Series-S-and-Series-X-can-now-run-retro-emulators-through-RetroArch-and-performance-is-excellent.505955.0.html
You have performance of a pi4 because it's limited by the developer mode, all the games running in native resolution is best it can do, it ain't worth 299$ for this emulation purposes
In a video I watched on YouTube.
The emulation performance looked a lot better than pi 4 and Nvidia shield.