

Used to have issues but now it's perfect

I think it was compiling shaders which caused it to stutter but then went away when related visual effects have compiled
It didn't launch without experimental for me

A on R4/R5, Magnifier on L5
Text is small.
Performance is variable. Set 1200x800, 80% resolution scale, 60fps limit, vertical sync off. Then in QAM set 12W TDP cap and 1200mhz GPU clock cap. I also experimented with Power Tools (via Decky Loader) locking CPU to min 3000 max 3500, and governer set to performance, didn't help a lot.
Quite playable, looks good, could be smoother but I'll take it.
Works perfectly
Some performance issues, not proton related. Turning off vsync made the game a lot smooter. Otherwise, works OOTB, I completed it, no issue.
Bluetooth dualshock 4 controller did not work. Plugging it in solved the issue. This was not an issue playing other/native games
Main menu wouldn't load backgrounds. Gameplay was unnaffected.

Works well on an APU at a lower resolution
Game seems to chug a little more than expected, I played at 640p upscaled to 1080p via FSR
Infrequent frame drops/stutter, but it seems like it might be a problem with the game based on reports from Windows users. Not too noticable and does not hinder gameplay.
I have only played with Experiemental Proton. Have not tested it with any stable versions.

Not the best performance, but playable. I set all settings to low, resolution scale to 70%, and get a stable 40fps at 40hz with rare drops
DXVK_ASYNC=1
Lowering resolution adds letterboxing, even for 16:10 aspect ratios
I've played about an hour so far, and would consider this playable. Apparently there are unreal 4 shader compilation issues, so I used "DXVK_ASYNC=1" with GE7-42 and have had pretty stable performance. I could push performance even lower and get a stable 60FPS, but Resolution scale at 70% at low with 40fps at 40hz has felt like a good balance for me.

for best graphical exp reduce to 40hz and active vsync, 25w usage , for best battery perf use 65% resolution and low sett, 9w usage
65% resolution and low settings use an average of 8/9w
In the first segement, I noticed occasional stutters. I'm not sure if this is a Proton issue, or if the Steam version just has a (rare) frame drop or something.
Switch to GE-Proton7-42, drop resolution scale to ~70%, overall quality ultra, antialiasing and shadows medium.