Thanks for the contribution @idk
For some more information …
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The first option effectively disables HTTP2.
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The second makes steam connect to more servers (from ~3 to ~10)
Which can improve things for some … or make them a lot worse.
For some other references;
https://www.reddit.com/r/SteamDeck/comments/16lnsg6/psa_solution_to_slow_steam_downloads_on_deck/
And a note from an Arch user on the git bug thread
So for those testing this out … be aware that you may actually favor the first option only.
~/.steam/steam/steam_dev.cfg
@nClientDownloadEnableHTTP2PlatformLinux 0
PS.
Another note.
For flatpak installs of steam the configuration file path is different;
~/.var/app/com.valvesoftware.Steam/.steam/steam/steam_dev.cfg