I recently got a steam deck lcd, and installed heroic launcher and logged on my accounts, and considered playing deadlight, which I have in my amazon luna. Searching about it, saw people playing it flawlessly, 60 fps, no stutters, via steam.
Using heroic launcher, I even get around 50 to 60 fps, but a lot of times the game stutters, dropping to 10~20 fps and then coming back after a few seconds. It uses 100% of the gpu and around 30% cpu. I configured it to play with ge-proton latest, version 28 iirc. Is there something I need to do to get better performance?
Noobie steam deck user here...