Bandwidth's divided equally among everyone so download late night or early morning for more speed. I'm tempted to suggest torrents for people looking to bulk download. What's the torrent that you used?
Most of the Gamecube/Wii/Playstation 2 games take forever to download on this website (at least when I last tried) but the servers do have their limits. For most of these games I just ending downloading them via BitTorrent as it's way faster to use a P2P connection.