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@schwim
As far I read on internet and benchnatks, If you have a working #Vulkan, the average performance between Windows and #Wine (proton) is equal. That means also, there cases where a Windows Games performs beter on a Linux with proton.
I assume the cause is also that some gamedeveloper enhance a game for steam deck also.
I propose to retest your case again.
@alphacyberranger
Context?