In previous versions of iOS, a scroll bar would appear on the right edge of the screen while you were swiping through a long Web page, email message, or document. But the scroller was merely an indicator of where in the page you were and how much content there was (the bigger the scroller, the less content).
In iOS 13 and the iPadOS 13, Apple has made the scroll bar more helpful and you’ll want to use it to scroll long pages more quickly than you can with swiping. To use the scroll bar swipe slightly to make it appear, press and hold the scroller and drag it to scroll. The only hard part is that it can be tricky to grab since it disappears a few seconds after you stop scrolling and it’s a thin target to hit with a thick finger. But give it a try since it makes scrolling in long pages so much easier.