Apps >MSFS click on repair…
It fixed a case of really bad stuttering that only appeared after the latest patch and only seemed to happen around large cities KLAX , KSEA , KLAS you get the idea…
I’d load into my plane ahd fps would be in the single digits… and flying was unbearable.
I did the repair thing and now I am fine… smooth as silk and at 25-30 fps in heavy congested airports…
I dont know exactly what “repair” did but it fied the issue and Maybe this might help someone else.