Thanks for the hint, will do (seems to be iOS specific, hmm)
Please just remove anything that interferes with the scrolling at all.
Should be fixed now (there's nothing trying to interfere with the scrolling, just an overflow setting to hide the hamburger menu that seemed to cause the laggy scroll on iOS. (Hopefully I didn't make it worse - redeploying while being Hackernews #1 is always a bit scary)
Much better now, ty!
Apple doesn't allow other browser engines than WebKit in its App Store, so Chrome on iOS uses WebKit, not Blink, and the problem is probably actually WebKit-specific.