In order to improve the efficiency of website optimization processes a novel pre-processing method at least includes: a) receiving website source code or web browser code from a website to be optimized; b) converting the website source code or web browser code into an electronic image; c) mapping web page elements corresponding to areas in the image; d) performing saliency analysis on the image; e) mapping the results of the saliency analysis to the web page elements; and f) selecting at least one web page for inclusion in a website optimization process based on the saliency analysis. A corresponding novel system is also disclosed.