Quote:
Originally Posted by JeanPierre
I'm afraid you've misread. I said your mileage won't vary. The expression you may be familiar with is "your mileage will vary". I did not give an opinion. If you want to optimize for reading speed, use ragged right and disable hyphenation.
I'm afraid I do not have the appetite to summarize, synthesize and present the decades of research that have established this, except to point you to https://scholar.google.com/schhp.
Happy reading, however you choose to do so. 
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A while back, I looked at quite a few publications that discussed the effect of typesetting on reading speed and comprehension. While there seemed to be a general agreement that, on the average, ragged right increased reading speed without any comprehension loss, most of speed increases were relatively small and there was a significant number of participants for whom reading fully justified text was took less time, i.e. they read faster.
Basically, you can't say ragged right will increase reading speed for a specific person but rather that a large group will show a relatively small increase in reading speed.