What is the optimal number of search results per page?
This document examines the differences between paging and scrolling as methods of presenting search results, and evaluates which is the best approach for users.
Web designers are constantly confronted with the problem of displaying large amounts of information in confined spaces. To deal with this designers usually have two options, either present the information on one long scrolling page or divide it into smaller amounts on multiple web pages.
Studies have found that shorter documents that require more paging tend to be superior in both performance and preference to longer pages that require more scrolling. (Bernard, 2002)
Evidence and further readings
Here you can find a list of references to dive deeper on the subject.