Thank you, jw.
There are 15 posts allowed per page. Each page takes longer to load as you get closer to 15 posts, especially if I'm making most of the posts as photo posts.
Starting a new thread wouldn't help because the same thing would happen on the very first page as you got closer to 15.
Actually, I had hoped that some discussion might be generated, which would mean fewer photo posts per page and a quicker-loading page as you approach 15 posts.
Maybe the answer is to make it 10 posts per page.