1. A computer-implemented method for reporting a performance score for a Web page, comprising computer-implemented operations of: sending, by a Web browser tool on a first computing system a request to a second computing system to load data from the Web page, such that the first computing system causes the second computing system to respond by sending the data to load the Web page in the Web browser tool of the first computing system; heuristically calculating a performance sub-score for each of a plurality of Web page performance metrics; combining said performance sub-scores to produce at least one interpretable Web page performance score; and compiling and outputting a report of the at least one interpretable Web page performance score.
5. The method according to claim 1 , wherein the step of heuristically calculating a performance sub-score includes determining a quantity of text found on the Web page.