I mean, speed reading is basically skimming (but without skipping words, if it makes any sense) and indeed, you won't be able to properly appreciate minor word choices in literary work. For me, speed reading is basically letting your subconscious brain absorb the words, instead of your conscious part. I once cheesily described it as "reading with your heart". You won't miss the feeling of the story, or the general content of a technical post, but you'll miss these tiny linguistical choices.

But opposite to what people are saying here, I find speed reading is great for technical documentation or for the first reading of a technical book. In pair programming sessions it's quite obvious because people will waste time reading SO answers that are obvious dead ends, for instance...