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Re:CSS Sprites vs. Data URIs: Which is faster on mobile? by mikeratcliffe on Thursday August 29, 2013 @03:29AM (#6294689)
Inlining all of your images as data URIs in your CSS is not a good idea because it will block the rest of the stylesheet from loading whilst images will not.
Re:CSS Sprites vs. Data URIs: Which is faster on mobile? by shawnjan8 on Thursday August 29, 2013 @12:48PM (#6296877)
and thusly will block the document from loading, most likely delaying first paint.