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[GH-ISSUE #10050] Extremely Slow Model Download Speed Despite Fast Internet Connection (Windows 11) #68647
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opened 2026-05-04 14:43:48 -05:00 by GiteaMirror
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Originally created by @ismailsemihsenturk on GitHub (Mar 30, 2025).
Original GitHub issue: https://github.com/ollama/ollama/issues/10050
What is the issue?
Hi Ollama Team,
I'm experiencing significantly slow download speeds when trying to pull models using the ollama pull command in the command prompt (cmd).
As you can see in the first screenshot, the download speed is often very low (around 10 Mbps or sometimes even lower):
However, my actual internet connection speed is much higher, as shown by a speed test:
Due to this slow speed, downloading a large model (e.g., 20GB) can take nearly 10 hours. The download speed sometimes drops to zero, forcing me to restart the process.
I don't believe the issue is with my overall internet connection or system resources. To test this, I started a game download on Steam while an Ollama download was running. Steam was able to utilize my full download speed:
Interestingly, as soon as I stopped the Steam download, the Ollama download speed dropped back down to around 10 Mbps:
Troubleshooting and System Details:
I will also provide server logs (server.log).
Thank you for your help and any insights you can provide.
Relevant log output
OS
Windows
GPU
Nvidia
CPU
AMD
Ollama version
ollama version is 0.6.3
@ismailsemihsenturk commented on GitHub (Mar 30, 2025):
further information:
But i think this is about the HF and not Ollama.
@ismailsemihsenturk commented on GitHub (Mar 31, 2025):
Subject: Update & Solution Found for Slow Download Speed Issue
Hi everyone,
I wanted to provide an update and share the solution that resolved the slow download speed issue I reported for ollama pull on my Windows 11 machine.
Recap of the Problem:
As initially described, while my internet speed tests showed ~100 Mbps, ollama pull commands in CMD, as well as downloads in the Brave browser, were capped at around 10 Mbps. However, applications like Steam and Microsoft Edge could utilize the full 100 Mbps bandwidth.
The Solution:
The issue seems to have been related to settings within the Brave browser, which is my default browser. I followed the steps outlined in this Youtube tutorial
Enabled Parallel Downloading in Brave:
Navigated to brave://flags in the Brave address bar.
Searched for the Parallel downloading flag.
Set the flag to Enabled.
Relaunched Brave when prompted.
Changed Brave's Secure DNS Settings:
Went to Brave Settings > Privacy and security > Security.
Under the "Use secure DNS" section.
Selected the "With Custom" option.
Chose Cloudflare (1.1.1.1) from the dropdown list.
Outcome:
After applying these changes and relaunching Brave:
Downloads within the Brave browser now utilize my full ~100 Mbps speed.
Surprisingly, ollama pull commands in CMD also immediately started downloading at the full ~100 Mbps speed.
Conclusion:
While the direct link between Brave's internal settings (flags and secure DNS) and the download speed of a command-line tool like Ollama isn't immediately obvious, changing these settings in my default browser resolved the bottleneck for both Brave and Ollama downloads running via CMD. Perhaps Brave being the default browser causes some underlying Windows network components or DNS resolution methods used by CMD applications to be influenced, or the act of changing these settings and restarting cleared a problematic network state/cache.
Whatever the exact mechanism, these steps fixed the slow download speeds I was experiencing with Ollama.
Thank you to anyone who looked into this. Hopefully, this solution helps others who might encounter a similar pattern of behavior on Windows with specific browsers acting as bottlenecks.
This issue can likely be closed now.
@faizan-ashaikh commented on GitHub (Aug 5, 2025):
@ismailsemihsenturk Thank you for your wonderful solution, I am not sure what the problem is but I was facing the same problem on my Pop OS 22.04, while running this command "ollama run hf.co/unsloth/Devstral-Small-2505-GGUF:Q4_K_M" and the speed was stuck at 3.5 MBPS and below, when I did this it shooted up to 22 MBPS.
Note: I did the same steps for Chrome and Brave both on my laptop because I was not sure which one was default.
@ismailsemihsenturk commented on GitHub (Aug 5, 2025):
I'm glad i could help 😊
@faizan-ashaikh commented on GitHub (Aug 5, 2025):
For anyone coming here on this closed PR, I found some solutions apart from the one mentioned above which might work if you are on Linux (Pop OS 22.04 LTS) and facing this issue with Ollama or Llama.cpp. My internet plan is 300 megabits/sec, and I was getting 5 to 15 mbps before the following.
After looking and debugging around for a while there were two major things that I did which then solves the slow internet speed issue while downloading the files and models:
@Khafan2019 commented on GitHub (Aug 22, 2025):
@ismailsemihsenturk Thanks for providing a solution for this issue. I had this issue right now and after applying this solution everything is working wonderfully! 👍
@pragnyanramtha commented on GitHub (Oct 23, 2025):
i am facing the same issue, but i am on archlinux (linux-zen) with "zen" as my default browser
my download speeds on my default browser are fine (around 100 Mbps )
But i am facing the same issue , is there any other way to fix this ?
@faizan-ashaikh commented on GitHub (Oct 23, 2025):
@pragnyanramtha so does zen browser not have a way to configure and update the internet settings? It should be similar to what we did for Chrome or Brave I guess