Internet speeds by state. Green is faster, red is slower. (Broadview Networks)

The Northeast is home to some of the fastest Internet speeds in the country, as depicted in the map above.

But even the fastest speed in the nation, Virginia’s 13.7 average megabits per second, is just more than half of South Korea’s average 23.6 mbps. The U.S. average is 10.5 mbps. Alaska had the slowest Internet speed at 7.0 mbps.

But nearly every state has shown steady improvement. All but two saw speeds accelerate between the last quarter of 2013 and the first quarter of this year, and even in the case of the laggards the declines were  a modest four percent slowdown in Virginia and two percent in Louisiana. Only Vermont saw slower speeds in the first quarter than a year earlier.

That data comes from a first-quarter report by cloud services provide Akamai, whose clients include some of the world’s largest corporations, giving it a close-up view of traffic online. The map was produced by Broadview Networks, also a cloud services provider which pulled the state-by-state data from the Akamai report, released in June. We reproduced the data in the interactive map below. Hover over each state to see its average speed. Darker shading indicates faster Internet speeds.

All told, 26 states posted average speeds higher than 10 mbps, Akamai’s “high broadband” cutoff. All states were above the “low broadband” 4 mbps cutoff. The most-improved state, year over year, was Kansas, which saw a 91 percent increase in its average speed. Arkansas and Idaho posted percent growth in the 60s, while Maryland and Georgia saw speeds increase by more than 50 percent.

The United States had the fastest average speed in the Americas, according to a nonexhaustive list of countries in the Akamai report’s appendix. It was outpaced worldwide by Hong Kong, Japan, South Korea, the Czech Republic, Finland, Ireland, the Netherlands, Sweden and Switzerland, according to the Akamai report. The United States tied with Denmark.

Washington, D.C., had an average speed of 12.8 mbps, ranking below Rhode Island, Delaware, Massachusetts and Virginia.