There's a great Wired article about this from last year: http://www.wired.com/business/2012/08/ff_wallstreet_trading/all/ http://www.wired.com/business/2012/08/

There's a great Wired article about this from last year: http://www.wired.com/business/2012/08/ff_wallstreet_trading/all/ http://www.wired.com/business/2012/08/ff_wallstreet_trading/... They explain how firms built private fiber networks between Chicago and New York to shave a few milliseconds off latency.