Fast really isn’t what it used to be, but there are ways that you may be able to keep from upgrading all your equipment just to enjoy online video.
Online video is becoming more and more popular, but it often assumes you have a fast connection. If you don’t, video playback can be affected.
Unfortunately, whatever you are trying to watch really depends on how that particular service has configured their ability to provide video for you. What I do is simply connect up a computer and then I can watch whatever I want.