Extremely slow and fluctuating download speeds

Same here, except I can reach speeds of 450-500mbps downloading from other sources

It’s scary to think about it. Imagine relying on a more server-based simulation, when the current server-client functionality seems so crippled.

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Same here, 2-2.5 Mbit/s download speeds in the Download Manager. For some packages it jumps up to 200 Mbit/s (rarely), but for most it stays around 2. (I have a gigabit connection 900-950 Mbit/s according to Speedtest btw.) I have 8 gigs of plane updates do download, this will take like 2 hours at this pace.

It’s really sad how it has been like this for the past ~8-10 months, and they do literally nothing about it, just “monitoring”.

I’ve been downloading for almost an hour now, but I just got a third of the way through.

I am in the Netherlands Europe.

My internet connection gives 500 mb/sec. See the results of the speed test I just did. But the download of this update is very extremely slow.

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I do a re-installation of the Sim and observe the same slow download of World-Updates and other contents. This will take several days to download.
My PC and the internet connection is not the bottleneck.

Uhh, that’s going to be fun, the downlad after reinstall took 14 hours for me, luckily I saved the contents folder, so I didn’t have to download the addons again.

I just ran the update yesterday and maintained 280+ Mbps almost the entire time. One thing I haven’t seen discussed that I’m kinda curious about is how those with problems are connecting. I was connected via Ethernet to my router, not Wi-Fi, and I wonder if that could be playing a roll.

I am connected by cable to my modem.
When I bought my new PC in November 2023, I was able to completely install FS2020 in just over an hour. Then it’s strange that I’ve been waiting for 2 hours at thís moment and haven’t even received half of update XVI. A waste of my Sunday afternoon!
image

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It took a whole two weeks to download 56 GB! Most of the time, the download speed was 2-3 Mbit/s. This happened all from day one since the MS Flightsim was released!

Of course WIFI doesn’t play a role, you’re really not giving people any credit here.

My Wifi has downloaded previous updates with 300mbits+ before and 400-500mbit when downloading from other sources (like steam and other sites) . It’s rock solid and very fast (wifi6 and 500mbit line).

The only app that causes issues like this is MSFS and their server infrastructure.

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I have been trying to download MSFS since this morning and had the same issue. The download speed has been around 8 Mbit/s no matter what I tried. Specifically, I tried:

  • Running the “netsh int tcp set global autotuninglevel=normal/disable/experimental” commands.
  • Uninstalling and reinstalling.
  • Using various VPN services with different locations.
  • Using cloudware WARP.

None of these things improved the download speed. Also, I realized a weird thing when running a speed test on my computer. When I have the client open and working on the update, SpeedTest recommends a server in Warsaw, even though I am in the US. My download speed is 1.5 Mbps, according to the test results. When I ran the test on my phone, I got 74 Mbps, and the optimal server was in the US, as expected. When I close the client, restart my computer, and rerun the test, my computer’s connection speed goes up to the usual higher numbers. I double-checked if I forgot to close the VPN, so it is not related to that. I am still trying to figure out what causes this issue.

Hi,
Same situation here in Switzerland, for many months. Download speed capped at ~2.5 Mbits/s while I do have a 1Gbit/s fiber connection.
However I sometimes have speed surge around 300Mbit/s but it does not last and goes down again at 2.5. :-1:

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Nope, my PC is connected via ethernet cable. WiFi is for phone and tablet only for me.

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Is MSFS using legacy CDN technology?
Is only Europe affected?

PlayFab CDN is a legacy feature supported for accounts with at least one title that has previously configured CDN. For new PlayFab developers interested in a content management solution, we recommend using Azure CDN. To get started, see the Azure CDN documentation.

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Could we tell which is in use, and would one over the other actually matter?

same here (Brazil), tried the CMD command as well to no change, to be honest this has been an issue pretty much since launch for a lot of people, it’s boggling to me that we are in 2024 and this is still an issue for so many people, compleatly inexcusable, I’m on an 800mbit fiber wired connection

According to the post directly above the CDN issues are not isolated to “certain locations in Europe”. So seems like Asobo is not on the right track when it comes to looking for the root cause.
My guess - Asobo focusing on MSFS 2024 which will have different download architecture, probably based on Azure CDN, no longer on the legacy PlayFab CDN. I’m pessimistic when it comes to fixing slow download issue in MSFS2020.

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Asobo can’t fix this as its almost certainly not an issue with the client. There was a post/video by Jorg where he explained some things done to improve things going forward, at that time. He explained that users were stuck trying to download SU14(?), and were getting massive pauses. The “fix” was to instead of allowing the sim to download updates with all 8 connections at once, it would only download 1 at a time. So 1/8th the bandwidth.

I’ll see if I can dig out that video, but it was presumably one of the dev. updates, and I think there was an official post on the forums as well that go into more detail, and coherence(!) than I have here.

Here we go:

To rectify the issue, PlayFab engineers made a fix to their servers such that they didn’t generate a new SAS token every few seconds for each file requested but instead only once every 15 minutes on each of their servers. On the Microsoft Flight Simulator side, our team reduced the number of downloads that could occur in parallel for each player from eight (8) to one (1) to relieve some of the pressure on the CDN. This meant that individual players would experience reduced download speeds but all requests could be processed successfully.

Instead of increasing capacity at the back end, no mean feat for sure as it’s not as simple as snapping you fingers to create additional bandwidth, our downloads were throttled to 1/8th to allow more users to get on to download the updates, then 8/8 was restored.

The problem here is that this doesn’t help for future updates unless they really do something to increase capacity on the server side. It also doesn’t explain the terrible download speeds many of us have in between these update releases, where the pressure on the CDN’s is reduced.

Read through the incident report, and you will come to realise that all the shenanigans going on are entirely server side. No client side fixes, just reducing capacity per client to allow more clients on.

It was a very interesting read, but also disturbing because of this line:

Now that normal service has been restored, we hope everyone is enjoying Sim Update 14.

I’m not sure how you would define normal service, but to me that doesn’t mean throttle all the downloads on patch day, then resetting that once most users are up to date. “Normal” needs to be improved, and only MS/Playfab can do that, not Asobo.

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The forum software tells me:

This topic has been solved

Only reply here if:

  • You have additional details
  • The solution doesn’t work for you

IT HAS BEEN SOLVED
WHICH SOLUTION???

Unbelievable, how unable to move since months.

I do not care, if it’s Asobo’s, Microsoft’s or PlayFab’s fault.

This behavior is known since MANY MONTHS and it did not change significantly.
The just “smile it away”.
In the November Dev Stream 2023 Transcription was stated: “All will be better in MSFS 2024. (concerning this problem)”

That means to me: For MSFS 2020 there will be no change for it.
What did they say in the last developer stream last week?https://www.youtube-nocookie.com/embed/D6yCff8SgXk (from 14:20)
“We are working on it.”

Does anybody feel, that there is somebody “working” on it?

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It’s currently day 3 of reinstalling MSFS on my system. Most of the time the download speed is at 2-3Mbps.

No, it’s not my PC’s fault. Not my internet connection fault. I have every game launcher known to man and every single one fully saturates my 750Mbps connection.

Some games are considered unplayable for various reasons, but MSFS 2020 is the only uninstallable game known to me


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