Technical Support -
Slow Download Speeds using the Blizzard Downloader Quote:
If you have begun the BitTorrent download and are experiencing very slow transfer rates, we ask first and foremost that you be patient. The nature of the BitTorrent transfer method is that it takes a few moments to make the connections necessary for the transfer. If you are still experiencing extremely show downloads after 10-15 minutes, please try the steps below.
1. Closing Background Applications
* Click here for instructions on closing all background applications, then try restart the downloader. If the download speed continues to be poor after several minutes, then proceed to step 2.
2. Firewalls*
* If you have a firewall, be sure that it is set up to allow for incoming connections on Ports 3724, 6112, and 6881-6999 for the TCP (also called TCP/IP) protocol. More information on how to open ports for some popular firewalls can be found on our Blizzard Downloader Networking Help page under the Firewalls section. If your firewall is not listed there or you need more help, please refer to your firewall documentation or contact the manufacturer.
* Important note: Please be aware that many popular firewalls will become very restrictive to traffic when disabled. Please be sure any firewalls you have installed are configured correctly and enabled in order to use the downloader effectively.
3. Routers*
* Be sure that the router configuration has Ports 3724, 6112, and 6881 through 6999 forwarded to your computer, and only your computer. Having the same port forwarded to more than one computer connected to the router can cause a conflict, which may result in slow download speeds. More information and instructions on how to forward ports for some popular routers can be found on our Blizzard Downloading Networking Help page under the Routers section.
* Be sure that no computers are in the DMZ (demilitarized zone). If a computer is set up to be in the DMZ, then there may be a conflict, which may cause slow download speeds.
* Be sure that any other computers on the network are not running any programs that utilize large amounts of bandwidth. Remember that a router simply lets all of the computers connected share the connection. It does not increase the bandwidth of the connection!
4. Adware/Spyware/Virus Scan
* Adware/Spyware or a virus on your system may also cause these symptoms. Be sure to run full scans of your system with the latest definitions for your malware programs. If you need more information regarding where to get a virus scanner, please visit out Computer Security Page.
5. Visit the Technical Support Forums
* If your problem persists, please visit the World of WarCraft Beta Technical Support Forum for a possible solution.
* Blizzard does not offer direct support for proxies (Internet connection sharing), firewalls, or routers. The settings provided are suggested settings only. If you continue to have issues while connected to a router or while a firewall is installed, please contact the manufacturer.
For further information on the Blizzard Downloader, please read our Blizzard Downloader FAQ.
The Blizzard downloader was also going really slow for me when I had 2 download the patch. I just opened the ports suggested above (3724,6112, and 6881-6999) and I went an average of 50 kb/s on a cable modem. If you have a firewall opening those ports may help, but I think its just natrually slow as molasses :-(
Sorry if this was not helpfull.