Not surprisingly the C-based JSON code is fastest, but least liberal. I like the idea of "try"ing with it, and if you get a decode exception, pass it off to a slower/more liberal parser.
By day, I'm a product manager serving a group of fantastic engineers at Square.
By night, I fight crime and solve mysteries with a robot pal of my own creation.
By midday, I like a snack, generally a cookie.
Part of this biography isn't true (hint, I like cookies and engineering, I don't own a robot).