The problem might be your school is shaping the bandwidth. Here's an example of how a p2p bandwidth shaper can work against Gnutella: Bandwidth Shaper Sample - typical of how some schools & ISP's use it (click on link) ie: giving priority to net surfing & low priorities to p2p sharing.

Try a magnet link & see what speeds you get: http://www.magnetmix.com/video.shtml
If slow, then the problem is most likely the school.