1. A content consumption measurement system, comprising: a communication interface; and a processor coupled to the communication interface and configured to: receive via the communication interface content consumption signal data gathered by a plurality of clients, the content consumption signal data reflecting for at least a subset of content pages user engagement by content asset comprising the content page; use the received content consumption signal data and content attribute data associated with each respective content page to compute for each content page a content consumption metric reflecting an amount of content determined to have been consumed; generate and display for each of one or more content pages comprising said at least a subset of content pages, a content consumption map indicating visually for each of a plurality of content assets comprising the content page, a content performance metric value computed for that content asset; and generate and display for each content page a demographically-specific content consumption map, each map indicating visually for each of a plurality of content assets comprising the content page, a content performance metric value computed for that content asset with respect to a demographic group with which the demographically-specific content consumption map is associated.