Hmm... take a look at the streaming statistics by opening [Alt]+[Shift]+[i] in the Desktop Player or hold down [Ctrl] and click the video stream in the Web Slingplayer. You'll see the the steaming statistics. That may help you figure out where the bottleneck lies. Or, if you're having a difficult time deciphering it, then take a 1 minute video capture of the video and the statistics, and we can have a looksie.
Btw, mReplay Broadcast (http://www.mreplay.com/broadcast/) is a software package which will allow you to record anything that's shown on your desktop. You can then upload the video to whichever video hosting site, like youTube. Which is essentially what did guy did (http://www.youtube.com/watch?v=Vfos4RHEGzI)