https://support.google.com/youtube/answer/74663?hl=en Watch videos on slow connections (Dial-up) Still rockin' the 56k? No problem. Even if you have a slow Internet connection, you can still watch YouTube videos. Here are some tips on optimizing your viewing experience:
Choose lower video quality (such as 240p and 360p) by clicking Settings in the video player. The player will remember this for future playbacks until you close your browser. Start the video and then click the Pause button immediately. Wait for the gray video progress bar to load a bit before clicking Play. If on a computer, use a browser that supports the latest video codecs like VP9, such as Chrome or Firefox.