Q: I can't play videos on the web - they just stall - stop and start.

when I am playing videos on the web, Vimeo for example, they play for about one or two seconds and stall.  Then they play another one or two seconds and so on for the entire video.  I have no means of changing the download size in safari preferences.  I am at a loss what to do.  i know of no-one else with this difficulty and the Microsoft laptop on the same broadband router dos not have this problem.