A few years ago, Cablevision decided they’d spend roughly $300 million to not only upgrade their entire footprint to faster DOCSIS 3.0 speed (allowing 100 Mbps service), but also on a Wi-Fi network that provides free Wi-Fi to all Cablevision customers. Plugged largely along commuter rail lines and at train stations into New York City, the service coverage area continues to grow. According to a Cablevision announcement today, the service is also getting faster. Starting today, the network will deliver downstream speeds of up to 15 Mbps and upstream speeds of up to 4 Mbps — up from the service’s previous speed of 3 Mbps downstream and 1.5 Mbps upstream. “With this increase, Optimum WiFi not only blows away 3G and 4G cellular data speeds, it s three times faster than the average wired residential broadband service across the country,” crows company VP Kevin Curran in a statement.