On DB I used to have it show me 1 comment per page because I tend to waste more time if I can look at more comments. They changed it to a minimum of 15 and this site has that minimum as well. It would be nice if the minimum was lower
I'd like to add to this: Allow users to see less than 15 images per page. 12 is a good minimum for me (I set it to that on Derpibooru before the 15 images per page minimum was put in place there). Twibooru currently allows a minimum under 15.