[raiguard] [2.0.11] Large in-game downloads could be much faster

[DeHackEd]

For context, I have fiber to the home at high speed (gigabit or so). But while inside factorio, downloads (eg: large mods, or game updates) are often self-throttling to about 3 megabytes/second. I know it could go faster because the TCP receive buffers are highly full when I check them:

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tcp   2357492      0 192.168.0.14:54156      138.199.57.66:443       ESTABLISHED 3985/bin/x64/factor 

I also tried direct downloading the same content from a linux shell (factorio logs contain the URL, and I have my own authentication token). I can hit full speed consistently. However the game itself throttles.

My speculation as to a reason is that the menu screen still runs at 60 fps and as a result the network buffers are only checked periodically, resulting in a lot of available bandwidth being left on the table.

[Rseding91]

I am not able to reproduce any such issue when downloading huge mods in-game. I suspect this might be operating system socket specific (I'm on windows)?

[raiguard]

I also cannot reproduce because Factorio is able to saturate my 200 Mbit/s internet connection. Your conjecture might be correct - we update libcurl on the main loop which only runs 60 times per second. Perhaps moving it to a dedicated thread would help things, but that is a fairly invasive change to fix a relatively minor issue.