I am running everything at lowest settings, except shadows which are the second lowest setting, and I am using TAA (or was it SMAA I don't remember) and I am using a replacement DLL file that replaces the DLSS with AMD FSR 2.2.1, FSR is set to scale 1.5 (means the internal resolution is rendered at 75% of native resolution, but I added AntiAliasing before FSR)

I also lock the game to 30fps,

This should not run at max power draw from the system on a chip, I'd rather prefer 15-30% more battery life than fancier graphics.

I wish I could get medium textures, but at least while using FSR (tried with FSR1 also) there is not enough VRAM on the steamdeck to fit medium textures. I think when I tested medium textures, a few textures suddenly popped up to medium quality, but most just stayed at low.

I've only played through Act1, just treated it as a tutorial with an origin character, and now I am playing through Act1 again with a custom character. (I borrowed a friends GOG version, but now I bought the game on steam, and I copied over my GOG saves to my desktop but I chose not to put them back on the steam deck in the steam versions wine prefix)

I hope they improve the CPU usage issues in Act 3 before I get there. I suspect it's mostly unfixable, maybe I will need to play the game at 20 or 25 fps in Act 3, I don't know. I am in no hurry to beat the game, I am a family guy and I just get to play a bit here and a bit there, so the steam deck's sleep function is a ~~god~~ GabeN send. I would not be able to play a game like this at this point in my life if it were not for that, and it was the main reason I bought a steam deck.