I tried it on Windows on the deck and it wasn’t what I’d call playable. I have relatively high framerate standards, but…it was like 15fps. Might be better on Linux.

What did work decently was streaming it from my XBox Series X via XBPlay.

I’m sorry, but why in the ever loving fuck would someone install Windows on a Steam Deck?
As a dual boot to play games I have on Game Pass but not Steam, like Expedition 33.
That makes a terrifying amount of sense