Hmm, that sounds more like a network problem to me. The Vimeo videos always play very well. I suggest you make speed tests of your connection at the different times. Maybe you will see some big differences. Then you can talk to your ISP. I use this one for my speed tests, but there are many others.
I ran speed tests when the videos were loading up no problem within seconds and then i've ran a couple tests when the videos are taking a long time to load, right now i can't even get a video to load at all and i ran a speed test to see the difference, my ping/dl speed/upload speed are all higher right now than when they were when the videos were loading. Right now my ping is 50ms, dl speed 2.43mb/s, upload speed 0.76mb/s
dont suppose you were looking at what your processor was doing at the time were you? i had a similar issue a few days ago, flash video's were making my processor max out for some reason, which obviously caused slowdowns no idea what was causing it, but i restored my system to the point before it started and all was good, maybe i picked up a nasty somewhere
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