Through a series of microwave towers, the dish beams market data 734 miles to the Chicago Mercantile Exchange’s computer warehouse in Aurora, Ill., in 4.13 milliseconds, or about 95% of the theoretical speed of light, according to the company.

Fiber-optic cables, which are made up of long strands of glass, carry data at roughly 65% of light speed.

via Firms race to transmit Wall Street data at nearly light speed – latimes.com.