Download speed throttling

[Immoros-1115]

Does anyone know of a solution to the problem of download speed randomly throttling down to ~3 MB/s even though Limit Download Bandwidth is unchecked? I see a huge number of posts with varying “fixes,” but none of them work.

Tested speed on Ookla right before writing this post. 700 Mbps. But the max download speed I can get through Battle.net is 3.58MB/s. Tried D4 and D3.

I’ve deleted the cache folder; flushed DNS; added Battle.net manually to allowed apps in my antivirus software; checked all drivers and windows updates; changed region to Europe and back to the US; checked the download limit but set to a massive number (999999999); and done every other thing I can find in the many, many posts with this same problem stretching back several years. Nothing fixes it.

I also tested on other computers on the same network. They don’t have the problem. It’s just this computer, which is new (a few months ago) and hasn’t had this problem before.

I’m not optimistic, considering I see posts from several years ago and no real answers on what is going on. But D4, for example, is going to take something like 6 hours to install, which is pretty insane.

[Kershew]

Hey there,

So there can be a few potential causes. The most common is a settings corruption within the Desktop Application itself.

Check the network limits for the Blizzard Desktop Application:

1. Open the BDA if it is not already open.
2. Click the Blue Battlenet logo on the top left of the app.
3. Choose Settings then Downloads.
4. Scroll down and adjust the Network Bandwidth Settings.

You can try disabling them but they may not solve slow download issues. If disabling does not work, you can try manually setting higher limits than what you are experiencing to see if that forces the client to allow a faster download rate. You may need to try multiple limits to find one that gives you the best potential rate.

The next most common cause would be connection related. Each route to each service is unique taking a unique path to get from your system to that service. an issue with a specific node can affect one connection to a service and not another service. This could also be something on the system or network affecting the download speeds. Any program that can prioritize specific types of data transfer can do this. (ASUS Armoury Crate, Killer Network Intelligence Center and HP Omen Command Center are just a few programs that can do this.)

Try doing an extended power cycle on your system. Turn off all devices including the modem. Wait 30 minutes, turn on the modem, wait 5 minutes, turn on any network devices, wait 2 minutes, turn on your computer and try the game.

You can try switching your DNS settings to use a free public DNS servers instead of your ISPs Servers:

The Best Free and Public DNS Servers (July 2023)

We do not have individual steps for specific modems or routers so if you need assistance accessing or updating the devices, contact the device maker/provider.

Sometimes firewall or routing software/hardware will have some advanced settings to prioritize and manage types of network traffic. Normally that is not an issue but we have seen situations where it can interfere with the delivery of the data for our games/voice chat.

Let’s try turning off these features:

QoS
SIP ALG
RoG (ASUS Routers Only)
Security firewalls (Some ISP provided modems)

Not all devices will have these options and the steps for turning these functions off will be different depending on the make/model/software version of the devices and programs involved. If necessary look at the documentation for your security and routing products to find out how to turn these options off.

In some cases there is a corrupt or misconfigured setting within the router or modem. We cannot say what that might be offhand but the easiest way to resolve these conflicts would be to factory reset the router and/or modem.

You may need to look up your specific model for the steps on how to do this and in some rare cases you may need to have this done by the ISP. Feel free to reach out to them for assistance if necessary.

From there we want to look at running programs on the system. Try running your system in selective startup mode: https://battle.net/support/article/200483

Finally, We need to not only remove all data relating to the Battle.net Desktop Application and affected game client, we need to ensure we have good permissions for reinstall.

1. Ensure the Desktop Application or setup is not running and open File Explorer (Right click Windows Start Button)
2. In File Explorer, navigate to the folder where the desktop application would normally be installed. Delete that folder if it exists (usually program files x86)
3. Type the following into the address bar (not the search bar): %APPDATA% and press enter.
4. Delete the Bnet and blizzard folders inside the appdata folder if they exist.
5. Repeat steps 7 and 8 with %PROGRAMDATA% %LOCALAPPDATA% and %TEMP%
6. Empty the recycle bin.
7. Create a new administrator account: Blizzard Support - Creating a New Administrator Account
8. Once the account is created, shut down the computer, wait 60 seconds, restart, log into the new profile.
9. Now reinstall the app to the C: Drive.

If that doesn’t solve the issue, then I recommend submitting a ticket with an msinfo attached for further investigation. (instructions for collecting that msinfo report will be on the form.)

Click your name at the top right of this page, click support, click contact support.

[Immoros-1115]

Killer Network Intelligence Center. That’s the culprit! Son of a . . . Force quit all “Killer” processes, and the download speed immediately skyrocketed. And that’s why it was only affecting this computer. Thank you!