Thanks for replying guys. I have a maximum of 600 global connections in my uTorrent settings.
Look at the following screenshots, it just plummets when adding more torrents… You see the dip in the first screenshot? I accidentially added then removed another torrent.
EDIT: Installed the latest beta of m0n0wall (freeBSD 8.2), same problem there =/ Also tried exchanging the DLINK (acting like a switch) for a 24 port Netgear rack mounted switch, same problem. So it's either my ISP/connection or the firewall. Gonna reinstall the DLINK as a router now and test.
EDIT2: Ok, connected my laptop straight to the WAN connection. 4 torrents = 9.7MB/s.
So clearly, it's the firewall messing it up.
EDIT3: The plot thickens… Installed ClearOS, same problem from my torrent machine. Laptop speeds @ almost 10MB/s!? There must be some very weird setting on the uTorrent machine that bogs down my whole connection?
EDIT4: Complete reinstall uTorrent, cleared registry from entries and did some tweaks. All is well now, running at 10MB/S which is the limit I put in uTorrent.
Thanks for trying to help!