[imaok]

I'm in the first camp of looking up every word you don't know. In my opinion speed reading doesn't do much for you if you don't know enough words. I saw an article that explained how fast our comprehension drops when there are words we don't understand in a sentence. This was done by using a slider that would hide a percentage of words in an English paragraph. Basically if you know about 90%+ of the words you can understand everything, but things drop off very quickly from there. Once you have no chance at understanding the thing you're reading I think the benefits of having read it are marginal compared to just looking up the words you don't understand.