You need to limit the upload rate and download rate of µTorrent according to your internet access' capabilities, so that there is a reserve left for other internet activity (browsing, chat, etc…) , if you want to watch a video stream, you might need to pause torrenting.
µTorrent got a built-in help fpr that:
µTorrent > Options > Setup Guide > select the "Bandwidth" test and run it > select the proposed setting.
That should do the trick.
