Microsoft Flight Simulator FAQ

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Slow download speed



Note: Before attempting the steps below, make sure to use an ethernet cable instead of wifi, even if your wifi is stable. Some users reported that using a wired connection immediately fixed the problem.

If you have reached your Data limit cap you might be prevented from downloading additional data. The data cap will reset at the date you have set up. By default, it should be on the first day of every month, unless you have selected a different day.

If you are experiencing slow download speed when downloading or updating Microsoft Flight Simulator, please do the following:


  • In the Windows search bar, type Command and look for ‘Command Prompt
  • In the menu select “Run as administrator
  • Enter: netsh int tcp set global autotuninglevel=disable
  • Press enter
  • Reboot your computer



1. Right-click on the “Network Windows 10 Network Icon / Wi-Fi Windows 10 Network Icon” icon on the bottom right corner of your screen to open up the menu shown below.

2. Click on Open Network and Sharing Center.

3. In the Network and Sharing Center window, click on Change adapter options. 

Network Sharing Center


4. You will then see a list of network adapters available on your computer.

Network Adapters


5. Right-click on your active network adapter (Ethernet or Wi-Fi) and select Properties.

Adapter Properties

Note: If you’re connected to the internet wirelessly, the corresponding adapter should be “Wi-Fi“. However, if you’re connected to the internet via a LAN cable instead, the corresponding adapter should be “Ethernet“.

6. In the Properties window, scroll down until you see Internet Protocol Version 6 (TCP/IPv6)

Properties Window

7. Uncheck the Internet Protocol Version 6 (TCP/IPv6) checkbox and click on OK to save the changes.

Now that IPv6 has been disabled on your computer, reboot your computer for the setting to take effect.



Some users reported that using Netlimiter and setting the download speed between 5 and 20 Mbps helped them bypass the looping issue.



If you set up a Data bandwidth usage limit your download speed will be limited to the value you have set up (5Mbps, 20Mbps or 40Mbps.)

To set up your Data Bandwidth Usage Limit to unlimited, please do the following:

  • Launch Microsoft Flight Simulator
  • Go to Options > General > Data
  • If the bandwidth is set to 5Mbps, 20Mbps or 40Mbps move the cursor to Unlimited
  • Apply and Save




Internet throttling is when your Internet Service Provider (ISP) limits your internet bandwidth or speed.

Reasons why your ISP might throttle your internet speed:


Network congestion.

An ISP can reduce the internet speed of everyone located in a specific area during times of heavy internet use. If your download speed is fine from 10 a.m. to 6 p.m. but sluggish between 6 p.m. and 11 p.m. your ISP likely throttles your internet speed during peak hours.


Data caps.

Some ISPs will limit how much high-speed data you can use in a billing cycle. Going over that cap will result in some bandwidth throttling. Double-check your contract or contact your ISP support line to know what your data cap is.


Paid prioritization.

This is when your ISP throttles certain types of data because it takes up a lot of bandwidth.

Typically, if your internet speed is fast when downloading a small amount of data but becomes very slow when downloading a large amount of data, your ISP is likely penalizing you for using up a lot of bandwidth. 


How to test if your internet is being throttled. 

To test if your internet is being throttled you can try using a VPN to prevent your ISP from seeing what kind of traffic is coming and going on your line. 

Run a speed test without VPN then run the speed test again using a VPN.

If your connection is significantly faster with the VPN, your ISP is likely throttling your service. If that's the case, contact your ISP to discuss the issue.


  • Make sure that your hard drive doesn't go into sleep mode
  • Close the app and restart it rather than letting it hang. Note: the download will resume from where it left off (you will not have to download from the start again.
  • Turn off any security software that may be interfering (UAC, Antivirus, Firewall).
  • Change the installation repository (from C: to D: for instance) or try creating a new installation folder in the drive of your choice (for instance create "MSFS" in your C: drive)


Was this article helpful?
57 out of 230 found this helpful


  • Avatar
    Ângelo Tadeucci

    It worked

  • Avatar
    Diego Wilhelm

    Perfect!!!! 200kbps to 240Mbps!!! Thank`s!

  • Avatar
    Cooper Bowen

    Doesn't work


  • Avatar
    Daniel Lamboy

    Worked for me. Depending on filesizes, as it seems to download single files instead of a large package and unpacking it afterwards I get up to 500Mbit out of 1Gbit

  • Avatar
    Marcus Nordvall

    No change here.

  • Avatar
    Logan Clarke

    Worked Well, Went from downloading at nearly 1GB per hour, to 2GB in 7 minutes

  • Avatar
    Khurram Virani

    This allowed me to get past the TBM splash image (loading?) screen (right after pressing any key). It was stuck with the unlabelled blue progress bar forever. I think the firewall settings change is what helped maybe, but not sure. Anyway, thanks!

  • Avatar
    Cody Staub

    Worked for me just running the command. I wasn't even making it to the install update dialog box before running the command. I'm now downloading on average 120 Mbps (which is close to my ISP speed).

  • Avatar
    Austin Walsh

    works! getting around 200Mbps now

  • Avatar

    It works, thanks for the quick guide!

  • Avatar
    Kota Yamakawa

    Can someone help me out, what does it mean by " In the menu select “Run as administrator” ", does it mean to run MSFS as administrator? I have done this and when I type in "Enter: netsh int tcp set global autotuninglevel=normal" to the cmd, I get "Set global command failed on IPv4 The requested operation requires elevation (Run as administrator)." 

  • Avatar
    tyson newton

    Worked Great thank you ! i downloaded more in 5 mins than i did in 2 hours 

  • Avatar
    Jason Byrne

    @Kota Yamakawa
    1.  Click the Start menu
    2.  Type:  Command Prompt
    3.  Right-click on "Command Prompt" and select "Run as Administrator"


    Edited by Jason Byrne
  • Avatar
    Kota Yamakawa

    @Jason Byrne 

    Thank you so much for the help, I got it working and it drastically sped up my download speed.

  • Avatar
    Michael Wert

    You're literally a first party product, why the hell are you suggesting people turn off basic security features to install?

  • Avatar
    John O'Flaherty

     I don't see any difference with the command prompt.  What's the prompt to revert it back the other way, to where it was?

    (Not the "Run as Admin" part ... the big long code number that looks like a VIN).

    Edited by John O'Flaherty
  • Avatar
    Marcin Wiśnicki

    This was already set as default on my computer. Download speeds alternate between 200mbps and almost zero. 

  • Avatar
    Rui Leite

    Worked perfectly, now downloading at 525mbps. (with the command only).
    Thank you!

  • Avatar
    Cian Mattson

    Excellent thank you! Took a half hour to download 5gb initially. After these steps, downloaded 5gb in 2 minutes! Just remember to turn firewall and other security back on when you’re finished.

  • Avatar
    Robert Sternhell

    Command line and disabling windows firewall worked for me. Download speeds are significantly increased although we really shouldn't need to do this for a first party product...  I am experiencing high cpu usage for the downloader, anyone else getting that?

  • Avatar
    Paul Tinsley

    Worked for me, once I had also closed and restarted the downloader again, after executing the command prompt command. Went from 2k/sec to over 10k/sec, which is my usual speed.

  • Avatar
    Brandon Engelman

    Not only does none of this work the part about my download not starting from the beginning is also bullshit. I knew there would be bugs but I can't even download the damn game!

  • Avatar
    Ajit Subramaniam

    Works really well! downloaded 2GB in just 10 mins.

    Before running the mentioned command, the speed was at the least 10 times slower.

    Thank you very much for this.

    Edited by Ajit Subramaniam
  • Avatar
    xander cole

    Works great, went from 40mbps to 400mbps

  • Avatar
    Michele Gussarini

    Well it will be perfect to try out if the game worked out in the first place.

    Every time i close the launcher during the download i found myself to re-install it or else it will boot up the game like everything is ok.

    Which end up as well as you might expect since i still miss 58 GiB to download.

  • Avatar
    Iain Lambert

    So far I’ve tried autotuning=normal and disabled, installer cache to both a non-system drive and the SSD, firewall on and off, running the application as my regular user and Administrator. Yet still it only uses 3Mb/s of my 100Mb/s bandwidth.

    Does anyone have another option to try?

  • Avatar
    Elle de Jonge

    worked, only i had to go from right button start menu to "Windows Powershell (Admin)  before i was able to type the command line. Broke of the Flight simulator install before and started it after the command line enter. 

    update: It looked going very good, but got stuck again on vey low speed. With this speed it will take me 25 hours :-(

    Edited by Elle de Jonge
  • Avatar
    Dr Nic Williams

    I am running Google Wifi, and whilst I was connected to a mesh node via ethernet I was getting 0.1Mb to 2Mb. When I move the PC to central Google Wifi hub (still via ethernet) my download went to my maximum of 24Mb.


    update: it later drops down to 2-3MB. Turn off machine, wait, turn back on, restart FS download and I got 24Mb. Came back later and it was down to 2-3MB again.

    Edited by Dr Nic Williams
  • Avatar
    Iain Lambert

    Update - a combination of black holing the slow Cloudflare node and running a wire right to the router rather than using my power line connection (which is otherwise fine) has got me over 50 Mb/s, which is rather more like it.

  • Avatar
    tomer dorevitch

    My installation has been stuck in the same place for three hours. It downloads some mega-bytes and goes back. What can I do?


    Edited by tomer dorevitch