This article by Jakob Nielsen goes into that a bit: http://www.nngroup.com/articles/response-times-3-important-limits/ http://www.nngroup.com/articles/response-

This article by Jakob Nielsen goes into that a bit: http://www.nngroup.com/articles/response-times-3-important-limits/ http://www.nngroup.com/articles/response-times-3-important-l... (1993). He claims <100ms feels instantaneous.