Seed Magazine writes about a study that links less readable fonts to better ability to recall the conten. A less readable font slows down reading. Makes sense.
However, in those studies the subjects had no choice but to read the poorly typeset text. In reality most reading happens in a context, where other texts -presumably easier to read- are just a glimpse away. A study that would take this into account would probably have devastating results for badly readable fonts: You can not remember what you didn’t read in the first place.