The infinite-scroll demo was pretty janky for me: Chrome 35.0.1916.114 on a Macbook Air.
Scrolled down to the bottom, and then got thrown around the page a bit before settling. Not a fun experience (and I've seen infinite scroll done right).
True, though it's jank nonetheless. I just expected a little more from a demonstration of a "jank-free" experience. Had it been a font-rendering library, I'd gladly be more forgiving. Maybe their demo should have been some kind of parallax scrolling (from whence so much of this scroll-related jank seems to originate)?
Scrolled down to the bottom, and then got thrown around the page a bit before settling. Not a fun experience (and I've seen infinite scroll done right).