

The intro video freezes, loading times are long

GAMEMODERUNEXEC=prime-run gamemoderun %command%
If played without tinkering or with forced Proton Experimental, the game is susceptible to freezing, and the opening video may not render (appears as colored bars) or be extremely laggy. When played with Proton-GE, the game works fine (at least on Training Mode).

gamemoderun %command%
Infrequent flashes of color. Opening video shows as color bar static (like TV static).
Sometimes freezes. Freezes less often on Proton Experimental.
Improved performance with gamemoderun than without, but in both cases, the game is prone to freezing. When attempting to reopen the game after force-closing it after a freeze, a DX11 error may appear, even if no settings were changed. This will occur until the device is rebooted.
The information from this report was gathered in Training Mode rather than actual Online games, so voice chat was not tested for this report.

Often freezes while ingame with a black screen, with the only escape being a force quit.
GAMEMODERUNEXEC=prime-run gamemoderun %command%
The game stutters when another player's audio breaks/crackles.
Frequent color flashes in various parts of the screen.
Often freezes during games. Players' voices can still be heard.

I could not hear the voice chat, and others could not hear me.
To fix, go to Settings > Audio and the microphone to manually selected ACK(...) Audio Controller and speakers to ACK(...) Audio Headphones (Spaker is playing without headphones)

Game ran perfectly out of the box. Played several matches without issue.