Source is this video:
Windows Was The Problem All Along - Dave2D
We could obviously compare performance between windows and steamOS before on the steam deck, or between windows and Bazzite on other handhelds. But this is the first time we have had official windows and SteamOS builds for the same hardware.
No, this one is different. It’s not an ISO you download (those are extremely sus and you would be right to be skeptical of them), but instead an open source set of scripts you apply to an existing Windows OS.
Edit: see my comment below, it seems to be partially closed source.
https://programming.dev/comment/17189096