As high-definition video clips become more popular on the internet, things are slowing down, say ISPs. “Most home internet use is in brief bursts — an e-mail here, a web page there. If people start watching streaming video like they watch TV — for hours at a time — that puts a strain on the internet that it wasn’t designed for, ISPs say, and beefing up the capacity to prevent that will be expensive. To offset that cost, ISPs want to start charging content providers to ensure delivery of large video files, for example. Internet activists and consumer groups are vehemently against those plans.”