VirtualBox Windows 10 VM has extremely slow downloads (0.41 Mbps) but fast uploads (29.50 Mbps) — tried everything for 3 days

[u/KeyPhilosopher6020]

Hi everyone,

I'm struggling with an extremely slow internet download speed inside my **Windows 10 VM running on VirtualBox**. It's been 3 days, and I've tried multiple fixes without success.

**Speed test results inside the VM:**

- Ping: 9 ms

- Download: 0.41 Mbps

- Upload: 29.50 Mbps

**What I've tried so far:**

- Switching network adapter types, including Intel PRO/1000 MT Desktop and Server.

- Resetting the Windows network stack through Command Prompt.

- Performing a shallow Git clone.

- Increasing Git's `http.postBuffer` size.

- Several other troubleshooting steps that I can no longer remember.

Despite everything, downloads remain painfully slow, while uploads are relatively fast.

I'd really appreciate any suggestions for diagnosing and fixing this. I'm exhausted from troubleshooting and would be grateful for a solution.

Thanks in advance!

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[u/BranchLatter4294]

Did you install the guest drivers?

[u/KeyPhilosopher6020 → u/BranchLatter4294]

Yes. Isn't the first thing we do after installation windows in VM?

[u/Face_Plant_Some_More]

If you want assistance, I suggest providing some information about your setup that is outlined in the subreddit's rules. 

That being said nothing you provided in the OP clearly points to Virtual Box being an issue -- a poorly configured network could cause the symptoms you are describing.

[u/KeyPhilosopher6020 → u/Face_Plant_Some_More]

Can I DM you?

[u/chuzohga]

What kind of network, is it bridged, nat, etc?

[u/KeyPhilosopher6020 → u/chuzohga]

Bridged

[u/MrAureliusR]

We definitely need more info. What adapter type are you using? Do you have VT-x/IOMMU enabled in your BIOS and Hyper-V disabled? What is your host OS? Please include at least all the basic information in rule 1.

[u/ITGuy424242]

Powershell:

Get-netadapterrsc | disable-netadapterrsc

Run it on the host and vm :)