DeepHour wrote:
It's actually the number of topic-headings in the thread lists that's been reduced. There were definitely at least 25 of these per page before, as opposed to 16 now.
In fact, I'm not sure the addition of a quick response window on the posting pages has made much difference, as I think the number of actual posts per page has either remained unchanged at 15, or may have been reduced by one from 16.

It was always 15 posts per page.
I have no idea how many topic headings in the thread lists there used to be.