On the Deck itself there are APU customizations at play, but not here. I don't know that the underlying OSs are fundamentally different. I know one is arch and the other is Fedora, but they're both immutable distros and should mostly be running the same things when launching in game mode.

For battery life it could just be a configuration difference in how the benchmarks were run on both OSs, or even down to the manufacturer software. Benchmarking hardware is hard, what can I say. I can say Dave2D isn't great at it, which I suppose is not the point of his channel, but I certainly wish some of the more technical channels weren't distracted right now, because there's an interesting three-way comp to be had here and some digging into interesting things.

That may be legitimate if the Windows settings are the factory settings. That's why I was pointing at memory management, because if you have a 32 GB device and you're assigning 3GB to VRam while the SteamOS version does something different things may get funky results in some games, especially running at higher resolutions and so on.

So it's entirely possible that the out-of-the-box setup of these machines on Windows and SteamOS are legitimately that different but that a better Windows config would mitigate it, which is still bad for something sold with a preinstalled Windows image, for the record. Or maybe the overhead of Win11 is just that big, I don't know. Would certainly love to see someone look into it.

I can tell you that bumping the default VRAM allocation on Windows handhelds has taken some AAA games from unplayable to quite solid in my experimentation, but I'm not gonna sit here swapping OSs and games back and forth for benchmarks. At least not for free.