A nationwide study released Tuesday by the Communications Workers of America labor union found that Internet connection speeds in the United States have increased little over the past year. The nation’s median data download speed gained just 0.4 megabits per second, it reported. At that rate, it will take more than 100 years before the U.S. attains speeds currently found in Japan, according to the CWA. The CWA’s findings are based on aggregated data culled from some 230,000 Internet users who participated in the organization’s Speed Matters Speed Test.