Performance is sublime. Works better than MX vs ATV Legends.
A bit boring - High settings seems to drop fps or increase lag. Have not measured.
Runs Perfectly
Performs amazingly and is fully playable. I completed the game and got all the achievements that didn't require multiplayer (which seems to work under Linux, there is just no online playerbase) without encountering a single issue.
Works great out of the box. I tried playing online, I can get in a lobby, but I'm by myself. It may be dead lobbies or non-functioning IDK
40Hz / 40Hz lets you play medium settings without the fan ramping up
It's a fun game and looks good on the Steam Deck.
PS3 controller not detected
The only problem I found was the PS3 controller (connected via USB) was not detected. I didn't play much since I much prefer playing this game with a controller. The quick ride I did with the keyboard seems to show it all works pretty well however.
Previously I made a report before I knew how to ensure the amdgpu driver is used: https://github.com/ValveSoftware/Proton/wiki/For-AMD-users-having-issues-with-non-OpenGL-games
Not starting
Tried with Steam Linux Runtime, Proton 4.11 and 4.2.9 and none of them would allow it to work. It tries to, it says running for about 10 seconds but then it stops.
Tried driving around in the first area. All works flawlessly so far. Using a xbox one s controller wirelessly.