[Locked duplicate] Transmission chokes my net connection

[Dean Mayers]

Mac OS X 10.6.6
Mac mini 2Ghz Core 2 Duo, 4GB RAM
Transmission 2.20 (11841)
10Mb/s down, 512Kb/s up connection connected wirelessly (same problem happens when I'm directly connected to the Airport or modem though)
Airport Extreme with wireless N
OS X Firewall is off

Whenever Transmission is open with a torrent downloading my Internet connection gets choked. I can't load any web pages or download anything else. The instant I pause the download or quit Transmission everything goes back to normal. The worst part is that while Transmission is choking the network it only downloads at a maximum of 2KB/s! Every other computer on the network gets choked (There are usually 4 other devices).

For example if I'm downloading something from usenet it maxes out at 1.25MB/s. Then I launch Transmission and my usenet download goes to around 600KB/s but Transmission is only downloading at 0-1KB/s. I quit Transmission and usenet instantly goes back to 1.25MB/s.

Here's an example of a torrent I'm trying to download where this happens:
4GB file
100 peers connected
1 tracker (it doesn't matter how many are connected though)
DL from 3
Ul to 15 (My upload is always maxed out)
700 known
As a side note as I hover over the other clients in the peers list most of them seem to be choking my connections. It says interested and choked. Another side note is that this mostly happens when I download anything other than music. Music is fine and quickly reaches maximum bandwidth without choking the network. Very strange.

My settings are:
Download with maximum of 10 active transfers
Seeding with maximum of 3 active transfers
Upload rate 50KB/s
Global maximum connections 100 peers
Maximum connections for new transfers 10 peers
Prefer encrypted peers is checked
Peer listening port is randomised and is ALWAYS open
Automatically map port is checked

Does anybody have any idea what it happening?

[Jordan]

Closing this duplicate thread. Please direct followups to this thread instead. Thanks!