I was reading other people's post here and I find that some people's video clips upload faster on Vimeo such as this person's... http://www.vimeo.com/1787735

Then there are these where I have to hit pause and come back in 5 minutes to view it. http://vimeo.com/1785500/ What's the difference?

The reason I'm asking is because the first person's video looks good enough to me and I'd like to upload video's that my friends can watch without waiting.
My couple of video test clips I posted on Vimeo take a long time to buffer out like the second link I added and I'm sure it's in the way it was rendered but I don't know what I'm doing yet.
I've followed Eugina's guide's to get my clips rendered for Vimeo.