The primary use of dextromethorphan is as a cough suppressant, for the temporary relief of cough caused by minor throat and bronchial irritation (such as commonly accompanies the flu and common cold), as well as those resulting from inhaled particle irritants.
As of Q4 2016, South Korea had the fastest average internet connection in the world at 26.1 Mbit/s according to the report State of the Internet published by Akamai Technologies. South Korea's speed is almost four times faster than the world average of 7.0 Mbit/s.
The fastest residential speed so far is 10Gbps, first rolled out in Minneapolis, but spreading to other cities. Fastest home internet access ever rolls out in US city. The fastest transmission link used inside the internet is harder to say, since many times, multiple parallel links get bonded to the same destination, as in this 12-core petabyte-per-second link (New Data Cable reaches 1 Petabyte per second).