It did for Trello, to name an example (search for speed in http://blog.trello.com/refining-the-way-we-structure-our-css-at-trello/ http://blog.trello.com/refini

It did for Trello, to name an example (search for speed in http://blog.trello.com/refining-the-way-we-structure-our-css-at-trello/ http://blog.trello.com/refining-the-way-we-structure-our-css...).