Time Warner Cable slow, Verizon hotspot really fast?

[Elijah]

I have Time Warner Cable 50 Mb/s down/ 5 Mb/s up. Over WiFi I actually only get between 15-25 Mbps. But that is still fast. I can download files very fast, always between 1-4 MB/s. But whenever I try to stream videos, (on practically ANY website) it loads very very slowly and is constantly buffering. It's not my computer because I got a new one like a week ago and it happens on all of my computers. (desktop/laptop/tablet/phone) But here's the twist, if I turn on a WiFi hotspot on my Verizon Galaxy Nexus, where I only get 1 bar of 4G LTE. if I do a speedtest on my computer, I get around 1.5-4 Mbps. But everything I do is extremely fast. Videos stream flawlessly, webpages load faster, it's just crazy. I don't understand what the deal is. It's like Time Warner Cable gives us an illusion by only delivering the full speed when downloading a file. Any suggestions?
Mb/s = MegaBITS per second
MB/s = MegaBYTES per second
Mbps = MegaBITS per second