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Many have complained they have severe download speed problems while downloading GOG offline installers with a browser.

The idea in this thread is to gather a list of the download servers that GOG browser users use when downloading the offline installers, which may help to understand if some servers or geographical areas have more problems than others. maybe helping even GOG tackle the problem better (in case they are interested in tackling it).

Instructions:

1. Go to your Windows Command Prompt, or Linux shell, and type:

nslookup gog-cdn-fastly.gog.com

2. There should be a line that says something like "Address: 111.222.222.222". If there are several Address-lines, pick the last one, the one after the "Name"-line that refers to some Fastly server. The first Address-line may refer to the nameserver that you are using for the query; the output is a bit different in Windows and Linux.

3. It is that Fastly IP address that we are interested in. Just report it. Done.

EDIT: If nslookup does not work for some reason, e.g. "query refused" or unknown server, try instead:

ping gog-cdn-fastly.gog.com

It should report the IP address as well. One difference between nslookup and ping is that to my knowledge nslookup does not care about your hosts file, while ping does. So you might get different IP addresses between the two, in case you have an entry in the hosts file.


Optional:

If you have a reasonably fast internet connection (at least 100Mbit/s, preferably much more; e.g. I have 600 Mbit/s, you can test it at speedtest.net), you can also test and report your browser download speed, just to give an idea whether your GOG download server possibly has a speed issue.

1. If possible, try to pick a time of day that you feel shouldn't be too congested, ie. non-busy hours. Just so that if you have a shared internet line or the GOG servers in your area are under lots of pressure momentarily, those wouldn't affect the results as we are more trying to see if Fastly is severely throttling the download speeds, even in non-busy hours.

So if you can run the test on Tuesday night at 4 am, that would be swell. :)

2. Select a big game in your GOG account that preferably has five parts (1 of 5 etc.), so at least 3 parts that are several gigabytes. Failing that, select three different games which are at least one or more gigabytes in size.

Try to select less popular titles because I am unsure if downloads are somehow cached if several people are downloading the same game in the area, giving you unrealistically good download speeds that don't measure that much your download speed from GOG (just guessing here, no idea if it really works that way). So try to select something else besides Baldur's Gate 3, Cyberpunk or even The Witcher 3, if at all possible.

3. With your browser (not Galaxy!), start downloading one of the files, and take a rough note on the download speed over several minutes, where it stays mostly.

4. Start two more file downloads at the same time (so that you would be preferably downloading three different GOG files at the same time), let it run for a few minutes if possible, and make a general note if your total download speed seemed to get better by downloading several files in parallel.

You can then report something like "with one file I got around 4 MBytes/sec, with three files I got maybe around 10 MBytes/sec total most of the time". If it fluctuates a lot, you may say that it e.g. fluctuated between 4-10 MBytes/sec most of the time.


Please try to keep this thread relatively tidy so that it is easy to find the IP-addresses (and possibly their speeds), so avoid complaining about your download speeds or talking about Galaxy downloads etc. in this thread. There are several download speed discussions where you can voice your opinions on how unfair life is.
Post edited September 15, 2024 by timppu
Non-authoritative answer:
gog-cdn-fastly.gog.com canonical name = gog-cdn.us-eu.map.fastly.net.
Name: gog-cdn.us-eu.map.fastly.net
Address: 199.232.37.55

So GOG isn't making use of IPv6, then?

Test of speed:
Roller Coaster Tycoon 3 Complete.
Downloaded via Powerline Ethernet adaptor:
10 MB/second; 732 MB.
Drops to 9 shortly after half download.

Time of day was 0800; EDT.
From Western Europe (France):

gog-cdn-fastly.gog.com. → gog-cdn.us-eu.map.fastly.net. → 199.232.169.55
I do get access to the full speed of my Internet access when downloading games from GOG, 60MB/s (~500Mb/s).

---
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dnovraD: So GOG isn't making use of IPv6, then?
Give them some time, IPv6 is a brand new standard from 1998.
Post edited September 13, 2024 by vv221
Western Canada:
ISP Connection Speed: 150 Megabit

Name: gog-cdn.us-eu.map.fastly.net
Address: 199.232.197.55

Time: 0730; CST
Single Download: Intravenous (660 MB) /w Edge using WIFI 802.11n (Max Signal)
Average Speed: ~1.2 MB/s
Max Speed: 2.0 MB/s
Notes: Stable average speed.

Time: 0750 to 0805; CST
Multi-Download (3 Files): Wolfenstein II: The New Colossus /w Edge using WIFI 802.11n (Max Signal)
Average Speed (per file): ~1.7 MB/s
Max Speed (per file): 3.8 MB/s
Notes: Wild changes in speed from 300 KB/s to 3.8 MB/s across all files at once.

WIFI was probably capping my multi-download test at times, but it's all I have access to at the moment. The above results are the best I ever see, evenings are much worse.
Post edited September 14, 2024 by MikeMaximus
avatar
MikeMaximus: .............
What is your ISP connection rated at?
Mine is 100 Megabit, and I have a fibre to the home connection, that is very stable.
I'm at the bottom of Australia.

On a good day or time with GOG, my average download speed is between 1.2 and 1.3 Megabytes a second (around 10 Megabit per second).

That is for a single stream for a browser link.

I have experimented with curl to download a game file from GOG in sections, simultaneously (4 threads), and they each download at roughly my single thread speed, so about 5 Megabytes in total, and then my script combines them into one file.

So I can use a multi-thread downloader program to get around 5 Megabytes a second from GOG.
Before the Fastly CDN fiasco mid last year, I used to get around 5 Megabytes a second from a single thread with GOG, had gotten that for years. And that was with a 50 Megabit connection that was copper wires to my home.

EDIT
The nslookup is failing for me right now - DNS timeout and unknown server.
I have used it in the past and it was fine.

With Ping I got - gog-cdn.us-eu.map.fastly.net [199.232.193.55]

P.S. When I have checked in the past, the server used is one of a few from the North of the USA.
Post edited September 14, 2024 by Timboli
nslookup gog-cdn-fastly.gog.com

Address: 151.101.245.55

Speed test:

Downloaded on Sunday 3am "Stargate: Timekeepers"
With one file the speed fluctuated mostly around 15-20 MBytes/sec.
Downloading three files in parallel didn't seem to increase download speed much at all, maybe at best around 22 MBytes/sec.
(My theoretical maximum download speed is around 75 MBytes/sec).
avatar
vv221: From Western Europe (France):
gog-cdn-fastly.gog.com. → gog-cdn.us-eu.map.fastly.net. → 199.232.169.55
I do get access to the full speed of my Internet access when downloading games from GOG, 60MB/s (~500Mb/s).
I tested your server with the "hosts file trick", and got only a measly 6 Mbytes/sec total downloading three files in parallel.

So either the internet line between Finland and France is quite poor or congested even on Sunday 3am, or it just doesn't work the same way for different users, even if they are connecting to the same server.
avatar
Timboli: The nslookup is failing for me right now - DNS timeout and unknown server.
I have used it in the past and it was fine.
With Ping I got - gog-cdn.us-eu.map.fastly.net [199.232.193.55]
If I enable my work VPN so that it uses the DNS that the company uses (public DNS, not internal AD DNS), I get a "query refused" error on all nslookup queries, regardless of the address.

Do others like nslookup google.com or nslookup gog.com still work for you, just not that fastly.net address?

I guess ping is another way to check the IP address, it still works for me even with VPN.
Post edited September 15, 2024 by timppu
Here is my result:

Name: gog-cdn.us-eu.map.fastly.net
Address: 146.75.117.55
Aliases: gog-cdn-fastly.gog.com
UK User

Name: gog-cdn.us-eu.map.fastly.net
Address: 199.232.53.55
Aliases: gog-cdn-fastly.gog.com

I'm getting about 11MB/s

I'm on a Gigabit line, but just ran a speed test and only getting 10th of what I should. Need to look at my network


Edit: Found the weak point in my network

Now getting 34MB/s
Post edited September 15, 2024 by mechmouse