She is a latecomer to the information superhighway, but 75-year-old Sigbritt Lothberg is now cruising the Internet with a dizzying speed. Lothberg’s 40 gigabits-per-second fiber-optic connection in Karlstad is believed to be the fastest residential uplink in the world, Karlstad city officials said. “In less than 2 seconds, Lothberg can download a full-length movie on her home computer — many thousand times faster than most residential connection