Regarding performace, you should not two things.
One, you can pause and restart your downloading whenever you like and however often you like (as long as the tracker is still there) but you will lose all credit for doing so. You see, what makes Bit Torrent so great is that it only allows you to download as much as you're uploading (with a few caveats I won't go into, at the moment) so no one can "leech." This ensures a healthy network and, in turn, gives everyone good bandwidth. However, if you restart, it can't know how much you've already contributed and will treat you like a leecher, again. So, it really is better to download the file in one fell swoop (for you, anyway). This might explain why you're not getting the speeds you were hoping. It takes a while for the system to get to it's peak download speed but when it does, it is awesome!
Second, your peak performace will be hampered if you are behind a firewall/NAT server. You see, the more people that can participate with you, the better the system will work for you. However, if you are behind one of these things then, while you can connect to people, no one can connect to you. This uni-direction connectivity gives you less connections and, therefore, lower bandwidth. If you are behind such a thing, you must set up a forwarding rule to get the best performance.
I hope you enjoy your Star Trek and happy downloading!
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