Frustrated with YouTube videos that freeze-up when you try to watch them online? Then stop trying to watch them online.
There are no less than eight jillion utilities that enable you to download YouTube videos with one click. When you see a video you want to watch, perform that click and let the video download to some directory or folder on your computer. Then later when it's all there, watch it. You won't have to wait while more of the file gets downloaded because it's already all downloaded. Plus, you'll have it on your computer to keep if you like and watch again sometime.
I browse Ye Olde Internet with Mozilla Firefox as my browser of choice. I have Video DownloadHelper installed as an extension and it does a fine job of grabbing clips for later viewing. There are others. (RealPlayer is supposed to be pretty good for any browser.) Your time is too valuable to spend waiting for videos to resume when the connection is slow and things freeze up.