Microsoft Flight Simulator FAQ

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All versions - Slow download speed


There are many reasons your download speed might appear slow. The troubleshooting steps below will help you improve your download speed. NOTE: If the download does not progress, see Packages installation & decompressing issues - Basic troubleshooting instead.



Switch to an LTE or wired connection and try again. We do not recommend using wifi to play Microsoft Flight Simulator, even if your wifi is stable for everyday usage. A wired connection greatly reduces the risk of packet loss.



If the download slowed down, close the app to restart the download—the download will resume from where it left off. 



Have you set up a Data bandwidth usage limit in-game prior to the update? If so, your download speed will be limited to the value you select selected (i.e. 5Mbps, 20Mbps, or 40Mbps).


Microsoft Store, Xbox & Retail disc version

To change your Data Bandwidth Usage Limit back to Unlimited, you will need to wait for the new update to install. 

Once the update is installed, please do the following:

  1. Launch Microsoft Flight Simulator
  2. Go to Options > General > Data
  3. Move the cursor to Unlimited
  4. Click on Apply and Save


Steam version

To bypass the Data Bandwidth Usage Limit, delete the Steam Cloud save.

WARNING: Doing so will delete your logbook. Do not delete the Steam Cloud Save if you did not set up a Data Bandwidth Limit.

  1. Close Microsoft Flight Simulator
  2. In Steam, right-click on the Microsoft Flight Simulator icon
  3. Go to Properties
  4. Uncheck the "Keep Game saves in the cloud for Microsoft Flight Simulator" box
  5. Go C:\Program Files (x86)\Steam\userdata
  6. Find the folder corresponding to your profile and delete the folder (Steam\userdata\usernumber)\1250410"
  7. Restart Microsoft Flight Simulator



Power Cycle your router/modem to empty the DNS cache, reset tasks that may have stalled and re-select the least crowded channel for each frequency.

  • Unplug your router or modem from its power outlet.
  • Wait for 60 to 120 seconds.
  • Plug your router or modem into the power outlet.
  • Your router or modem will take a few minutes to reinitialize.



When the Receive Window Auto-Tuning feature is enabled for HTTP traffic, older routers, older firewalls, and older operating systems that are incompatible with the Receive Window Auto-Tuning feature may sometimes cause slow data transfer or a loss of connectivity. When this occurs, users may experience slow performance. Or, the applications may crash.

  • In the "type here to search" bar, next to the Windows Start menu icon, 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



If you have limited connectivity or other network constraints, you can limit how much bandwidth Delivery Optimization uses for background downloads. Lower values use less bandwidth but cause updates to be delivered more slowly. 

  • In the "type here to search" bar, next to the Windows Start menu icon, type Delivery optimization
  • Select Open
  • Click on Advanced Options
  • Check the box "Limit how much bandwidth is used for downloading updates in the background" and move the slider to 100%.




Some users reported that disabling IPv6 improved their network speed.

  1. Right-click on the “Network  / Wi-Fi ” 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. 
  4. You will then see a list of network adapters available on your computer.
  5. Right-click on your active network adapter (Ethernet or Wi-Fi) and select Properties.
  6. In the Properties window, scroll down until you see Internet Protocol Version 6 (TCP/IPv6)
    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“.
  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.

Note: If you do not see a significant improvement, we recommend enabling IPv6.



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. 



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.

Was this article helpful?
61 out of 258 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