As in my previous comment I'm using the latest beta candidate of steamOS and cryoutils, also I use a mod to make it work better on the deck (search steam deck on nexus and you'll find it)

But with that taken into consideration it runs pretty well mostly, in cities in can still get pretty low (drops to sub 30 in cities sometimes, occasionally lower) but most of the time it runs pretty well

When I'm inside caves or separate rooms (as in had to go through a loading screen to get there) it can even go to a stable 60

And for the record, I beat it and am in NG+, only taking a break to see what the fuss is with this cyberpunk update

took a bit of messing around to get it to work using desktop mode. Because of it I get this glitch where it loses the joystick and changes to keyboard controls such that I have to save. exit the game. and bring it back up to have it back to joystick mode. no idea what causes it. can play for large periods of time and it does not show but then it will show up two or three times in a night where im only playing for an hour or two.