Cut Paper Text By Half
http://www.theprices.com/3tipcut.htm

Communication Circle, The
1998

Abstract:

Reading from computer screens is about 25% slower than reading from paper. As a result, people don’t want to read a lot of text from computer screens: you should write 50% less text and not just 25% less since it’s not only a matter of reading speed but also a matter of feeling good.