Super slow downloads, great uploads

[MaxwellRenton]

Hello everyone!
For some reason LW is really slow on downloads with me (around 12 KB/s max), though the uploads reach up to (+100 KB/s) even with limited upload slots.
I tried it with providing no upload slots but that seems to be slowing the download rate even further.

I'm only downloading three BitTorrent files at the moment, one of them has up to 30 hosts, the others 2 to 6.
I run on a Dual 2 GHz PowerPC G5 Mac with 10.4.9.
My provider's bandwidth is 25600/2048 kbps and I have unlimited download.

So what might be the problem? Any suggestions or ideas?
Thanks in advance.