How many frames a second?
This is not a case of a figure existing somewhere in small print. There is no first-party number to find: no frame rate, no resolution, no count of graphics modes, and no statement that a performance mode and a quality mode are separate things in this game at all. Anything you read that puts a number on it is reporting somebody else.
A target on a page like this would be a guess wearing a number, and it would be quoted as though it were reported. There is a real cost to that: the figure would be repeated, aggregated, and eventually cited back at us as a source. Why unknown is treated as a publishable answer is set out under how we grade a claim.