Best way to start to configure a vid card for this game, goto the nvidia control panel, select the second option, open up the games section (find flightsimulator, you might have to add it manually) then choose default options. Now find appdata/roaming/*flightsim dir/usercfg.opt, and open it in notepad.
So now we have usercfg.opt file open in notepad and Nvidia Control panel in a second window. Go through the list of the control panel 1 by 1 and change the settings in usercfg.opt file to match the ones in the control panel.
When done save the usercfg.opt file, save the Nvidia config in the control panel from there.
Run the sim, and see how it performs. If you have good fps but its studdering, lock vsync and lower the setting from 100% to 50% and try the flight again, *this should now be giving you 30 fps, if it still studders, lower the vsync one more time to the lowest level, this will only give you 20 fps but should eliminate the studders.
I did this with all settings set to ultra with my 3060ti card, I can get it to produce 35-40 fps, but the studders are really bad, by setting the vsync to a lower value you will still have the same quality of graphics just a few less fps.
The studders in my case seem more to do with network performance ( the sim cant seem to supply the data fast enough on a 330 mbps connection) so that the game has to pause for a brief moment to wait for the next bit of data.
Hope this helps you it helped me a great deal when I got the new card. Good Luck…