Since I've never used a live feed on anything before, I can imagine it would be equal to running the game on a low-end PC, where it juts forward at times instead of being smooth.

Can anyone say for sure?

I guess this can be measured by looking up a video on youtube, if your connection doesnt stream fast enough, the video will just lag and look very bad.

It's better if you watch an event live instead of streaming a YouTube video because page load time can affect how long it takes for you to initially buffer the movie.

I am using Verizon DSL now, and it's extremely slow compared to most other high-speed connections, but it's all that I can get now. Watching a live feed requires the occasional buffer and it all depends on who's doing what on the network, most of the time.