Nonetheless I had to upgrade my PC. The FPS are not really high, BUT an A320 in New York at night with rain and ultra settings is a absolute worst case scenario.
In most situation I experience very smooth framerates. I´m quite optimistic still that 3rd party developers as like PMDG, Aerosoft,… will be able to develop the Airliner in a more FPS friendly way.
Flying with the Cessna Jet in New York in this scenario give me about 40fps. So quite great for such a simulator.
Of course for now 5900x and RTX3090 might not be the best choice in regards of effiency but I always tend to get the best possible 
It´s my hobby. Others spend thousands of euros/ Dollars for sailing or skiing equipment.
Regards
Marco