Fast reading of a great novel will get us the plot. It will get us names, a shadowy idea of characters, a sketch of settings. It will not get us subtleties, small differentiations, depth of emotion and observation, multilayered human experience, the appreciation of simile and metaphor, any sense of context, any comparison with other novels, other writers. Fast reading will not get us cadence and complexities of style and language. It will not get us anything that enters not just the conscious mind but the unconscious. It will not allow the book to burrow down into our memory and become part of ourselves, the accumulation of knowledge and wisdom and vicarious experience which helps to form us as complete human beings. It will not develop our awareness or add to the sum of our knowledge and intelligence. Read parts of a newspaper quickly or an encyclopaedia entry, or a fast-food thriller, but do not insult yourself or a book which has been created with its author's painstakingly acquired skill and effort, by seeing how fast you can dispose of it.
