11 turns is quite fast, but I think any efficient card with good players produces speeds in the same ballpark. Of course, bad players can speed up games too.
I recently played a game where both players dashed for Governor, but he used it for +cards consistently and I used it for +gold.
I think the game ended inside of 10 turns with an explosion of golds remodelled to provinces in my last turn, putting me 5:3 up.
Then there's Ironworks/Gardens games if both players open Ironworks... They're pretty damn fast too.