Is there any possibility of improving performance mode resolution and graphics quality on PS5? 1080p is quite rough to look at...
I'm not really qualified to answer if it is possible or not.
The performance mode is there to maximise framerate without too many compromises to visual quality, but something will have to suffer for it. We do have people working towards finding performance gains, so hopefully we'll be able to give you some good news in the not too distant future.