Can you elaborate on what “scroll performance” means? The only time I’ve had trouble with scrolling when I’m reading something on my phone is when an app or website thinks they know how to scroll better than the OS does.
I'm not sure how they meant it in this particular context but IMO good scroll performance with a lot of media on the page can be quite tricky to do on the web and a bit easier on iOS. This might be better these days than it was when I last did web dev (3+ years ago).
