1. A computer implemented method for generating a cognitive efficiency score of a page derived from eye fixation data for a page, the method comprising steps of: dividing eye fixation data for a page into a grid; determining a number of eye fixations for each grid element of the eye fixation data; establishing a threshold number of fixations above which a grid element is deemed to be seen; establishing a threshold number of fixations above which a grid element is deemed to be noticed; counting a number of seen grid elements and a number of noticed grid elements in said eye fixation data for said page; and producing a cognitive efficiency score of said page based in part on of the number of seen grid elements and the number noticed grid elements.