Yukari Haruzono, a computer game enthusiast in Tokyo, waited Sunday for an upgrade while her daughter, Yuho, 6, played. She pays $55 a month to be able to download data at high speeds.Credit...Ayumi Nakanishi for The New York Times TOKYO — The United States may be the world’s largest economy, but when it comes to Internet connections at home, many Americans still live in the slow lane. By contrast