Valve has made clear that it is looking to target a frame rate of 30fps for most games that are [...]
According to Valve developer Pierre-Loup Griffais, the Steam Deck is merely targeting 30fps as the "floor" for what the studio considers playable. As such, this doesn't mean that all titles that come to the Steam Deck will be locked at 30fps. Griffais notes that many games have shown that they can go well above this threshold based on testing that has been done internally. That being said, the Steam Deck itself will have a "built-in FPS limiter to fine-tune [performance] vs. battery life."
So what exactly does this mean? Well, if you want your own games to run at a higher performance level than that of 30fps, you'll just have to go to the options menu and turn off the FPS limiter that Valve will be including with the platform. It's a pretty simple option, but it's also one that makes sense on Valve's behalf to include.
Completely misleading title. Also already posted.