Originally Posted by wayback
No, that's not the explanation. Because if I pause the online playback at the beginning until the file download has completed, it's still jerky when I play it. So, it really does appear to be a problem with Vimeo's streaming player, not congestion, at least on my computers running XP.
I do not get this problem on YouTube. So I'm just saying if it plays jerky on Vimeo, it may not be because it really is jerky. The test is to find the file in your temporary internet files, copy it somewhere else, and play the copy on VLC. When I do that, everything is smooth.
But if you wait until the file has been completely buffered, it's now on your computer and Vimeo is no longer streaming it after that. If it still plays rough in the flash player, that's then on your end, not Vimeo's. But VLC might be able to play it more efficiently, though, so can play it smooth on your system where the Flash player can't.
You can't really compare streaming speed between Vimeo and YouTube unless you know their respective bitrates used in compressing the video and during streaming. I believe Vimeo has better quality video and higher bit rate, so it's harder to receive and decode the stream smoothly.
If you've got a way to playback smoothly, that's all that matters. I seldom have the problem you mention on my PC, but it's a pretty fast one.