First,any habit,which slows down your silent reading to the speed at which you speak,or read aloud,is inefficient.If you point to each word word as you read,or move your head,or form the words with your lips,you read poorly.Less obvious habits also hold back reading efficiency.One is "saying"each word silently by moving your tongue or throat or vocal cords;anothers is "hearing" each word as you read.
These are hebits that should have been outgrown long ago. The begining reader is learning how letters can make words, how written words are pronounced,,and how sentences are put together.Your reading purpose is quite different;it is to understand meaning.
It has been estimated that up to 75% of the words in Einglish sentences are not really necessary for conveying the meaning.The secret of silent reading is to seek out those key words and phrases that carry the thought,and to pay less attention to words that exist only for the sake of grammatical completeness.
An efficient reader can grasp the meaning grom a page at least as fast as he can read the page aloud.Unconsciously perhaps,he takes in a whole phrase or thought unit at a time.If he "says" or "hears" words to himself,they are selected ones,said for emphasis.