The personal brain-dump of Garrett Coakley

Akscyn's law

Hypertext systems should take about 1/4 second to move from one place to another. If the delay is longer, people may be distracted; if the delay is much longer, people will stop using the system. If the delay is much shorter, people may not realize that the display has changed.

Akscyn's law, coined in the early 80s during the development of the ZOG hypertext system.