It looks like this save is approaching the limits of what factorio can do in 16ms on current computers. In multiplayer fps is sacrificed for ups to keep up with the server. The headless server has less overhead than factorio with graphics thus it's easier for the server to maintain 60 ups while your ...

The save file is missing from attachments.

Yes. Default value is 1

Smokeping to monitor the network connection quality between the vps and the clients connecting to the vps. If the connection looks like this the lag will be terrible.

https://oss.oetiker.ch/smokeping/

The documentation is confusing. It should be AsteroidsMapSettings

/c game.map_settings.asteroids.spawning_rate = 0.5

Under surfaces click generate planets button then change your current surface to aquilo. Also check if editor is paused.

Factorio default port is udp 34197

I'd guesstimate that their payroll costs are ~$5 million per year. If anything the price is too low. We ought to buy the game twice unless we want scammy microtransactions to take over.

Getting a crash is also possible.

-Host multiplayer game with technology_price_multiplier.zip save above
-Join game with another instance
-Disable research queue /c game.forces["player"].research_queue_enabled = false
-Repeatedly change the research between steel processing and logistic science pack

The heavy mode false positive tricked me. Getting a real desync is more complicated.

-Host multiplayer game with attached save
-Start research logistic science pack until research progress is greater than 85%
-Cancel research logistic science pack (it must not complete)
-Start research steel
-Queue ...

It seems this issue only occurs when there is dns caching involved during the network outage?

If the error is this then the game is restored on the list.
Error HttpSharedState.cpp:158: CURL failed: code:6, 6; Could not resolve host: multiplayer.factorio.com

If the error is this then the game won't ...

In a new game

/toggle-heavy-mode
/c game.difficulty_settings.technology_price_multiplier = 0.5

Heavy mode check should fail.

When hosting a public multiplayer game the game will not reappear in the browse public games list after a network outage has been fixed. The game is still connectable using Continue from main menu or using connect to address. After the network outage is fixed the game host needs to quit and rehost ...

A speed test to cloudflare doesn't mean much in this case. Vodafone's route to cloudflare can be fast while its route to your friend is slow. In the below speedtest example you can see that vodafone uploads much slower to att compared to another provider in the same city. In this example vodafone ...

The lag spikes you were describing sounded similar to the lag I was getting when I was messing with these values. The developers provided more information about the performance implications of increasing these values here.

viewtopic.php?f=48&t=105316

It looks like a mod set extremely high friendly_base_influence_radius and enemy_building_influence_radius values of 15878. From what I can tell setting it back to the default value of 2 fixes the lag spikes in the vanilla save. I didn't test the modded save.

/c game.map_settings.enemy_expansion ...

Running command /delete-blueprint-library everybody confirm on a map with a big offline player blueprint library does not reduce ram usage on linux.

Load attached map on headless linux.
Connect windows factorio to linux factorio server.
Run /delete-blueprint-library everybody confirm
Ram usage of ...

These steps should result in a desync.

-Connect two instances of factorio in multiplayer with the attached save.
-Launch the rocket.
-Click continue in one instance, leave the victory gui open in the other instance.
-Run /c game.print(game.finished_but_continuing)

Thanks for the information and bug fix.

My reproduction step of connecting windows to linux is wrong. It looks like it's not the os that is the issue but the cpu generation.

Multiplayer with group of new cpus will not desync. Multiplayer with group of old cpus will not desync. Multiplayer with a mix of new cpus and old cpus results in ...