I also tried in my "clean" chrome profile (to rule out extensions) and it's still got really bad scroll lag. This happens as soon as I open the page.
Here is a video though I understand it's hard to convey since you can't see when/how much I'm scrolling. I can tell you I scrolled slowly down and back up consistently through this video.
Even worse, I just found that having that tab open (and visible) makes Chrome (no other app) laggy everywhere. Something is definitely wrong with that page. Also that page was open in a different chrome profile and it still made my main chrome profile lag when just trying to click around the text area for this comment on HN.
Edit: Some extra details for my setup, I have external monitors (4) and the Macbook Pro is closed in clamshell mode. Not sure why either of those things would matter but I figure both those cases are more common for people on HN (external monitors/closed laptop) than the general public so I wanted to mention it.
