Tangent: I've been trying to recall the author and title of a sci-fi short story that had slow computing as a central plot element. The protagonists had organic

Tangent: I've been trying to recall the author and title of a sci-fi short story that had slow computing as a central plot element. The protagonists had organic computers (eg DNA Turing machines or something). Massively parallel. Much slower than electrons. Used to chew thru intractable problems without deadlines. Like cracking encryption. Maybe it was Stephenson.