New web version is so much better and faster then current app. I would just drop the app entirely
Are you talking about the mobile site?
I opened it in Chrome (Android), opened the General Messages forum, then a long thread with many pages.
On the bottom of the page there is a page indicator (a slider with an arrow on each sides). I tried using the slider to advance a few pages but it did not react at all. Only the arrows work, moving one page at a time.
So it takes as many clicks as there are thread pages to get to the last page of a long thread, because it opens with the first page.