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 a

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).