The Netflix ISP Speed Index reveals the latest shifts in internet service provider performance for December 2015. In the United States, notable advancements include Cablevision, Charter, and Mediacom each climbing one position. Cablevision reached an average speed of 3.80 Mbps, Charter achieved 3.71 Mbps, and Mediacom posted 3.68 Mbps. Japan experienced significant ranking changes, with Nifty...