https://wccftech.com/steam-deck-targeting-30-fps-can-handle-all-steam-games/

Last week Valve announced the Steam Deck, their portable Zen-2-powered gaming PC that they promise will be able to run most games at 1280x800, although resolution doesn’t really mean that much on its own if you don’t know what type of performance the machine is targeting. Well, Valve recently let a few more details about the Steam Deck slip in a recent interview with IGN, and those hoping for glorious 60fps or unlocked portable gameplay are in for a disappointment. According to Steam Deck developer Pierre-Loup Griffais, achieving 30fps in games is their target (thanks to PC Gamer for the transcription).

If people are still valuing high frame rates and high resolutions on [other] platforms. I think that content will scale down to our 800p, 30Hz target really well. If people start heavily favoring image quality, we might be in a position where me might have trade-offs, but we haven't really seen that yet.