for some readers is skimming is like just skimming but not understanding the true essence of the article...and for some readers they like to read it a loud than with eye...I believe every human has their speed and capacity to do any task..in this case some people raise their speed of reading after reading certain paragraphs(not skimming) but reading literally.....and then they skim in the middle...if the speeds drops out...they read literally again....flow goes like a pulse....