Task switching, replacing one set of content with another (literally) isn't generally free: http://www.codinghorror.com/blog/2006/09/the-multi-tasking-myth.html

Task switching, replacing one set of content with another (literally) isn't generally free: http://www.codinghorror.com/blog/2006/09/the-multi-tasking-myth.html http://www.codinghorror.com/blog/2006/09/the-multi-tasking-m...