I just learned that PROTON_ENABLE_NVAPI=1 to enable DLSS got changed to PROTON_FORCE_NVAPI=1 in Proton 9.0 (including Proton Experimental). Just in case this helps someone in the future.

On another note: Feel free to let me know if you've got a good way to keep up with necessary/useful launch options. I've simply been having a look at what people use on ProtonDB. But I've come to the conclusion that a lot of the posts there use outdated or simply false launch options.

I can't believe how well Helldiver's 2 has worked for me. My friend on Windows has crashed all the time and the anti-cheat is super intrusive. But on Linux, literally no problems. No launch flags or anything, just click play in Steam.

Definitely a highlight of this timeline!

Putting this as a top thread as a PSA.

If the game is running smoothly but you're having random crashes, try this.

You need to run the game on DirectX 11 instead of 12 for certain graphics cards.

Insert " %command% --use-d3d11 " into the game's launch options in steam.