kremiso, see if turning OFF motion blur and dense scenery helps.
I have better idea, there is build 1.1.1 released and I added a msaa settings and draw distance, I would suggest setting msaa to NO and draw distance to FAR. But even with everything to max I can play on steam deck at rock solid 90fps with like 20-30% power used so a lot of headroom. Game is very light on resources but these resources should be relatively recent