Amazing story on how much 350μs is worth to a stock exchange:
http://www.nytimes.com/2014/04/06/magazine/flash-boys-michael-lewis.html?emc=edit_th_20140401&nl=todaysheadlines&nlid=33329601&_r=1#story-continues-17
http://www.nytimes.com/2014/04/06/magazine/flash-boys-michael-lewis.html?emc=edit_th_20140401&nl=todaysheadlines&nlid=33329601&_r=1#story-continues-17