Departure/arrival DIFFERENT FPS

Hello can someone help me? I play in Ultra options. When I start playing in Paris Orly, 45-50 fps and smooth. Top! But if I start elsewhere and I arrive in Paris Orly, less FPS and the game is slow … Why? Departure = ok Arrival = problems. I had this before the update and it didn’t change anything. My configuration: RTX3090, RYZEN 9 5950X, 32Go Ram.

Sorry for my english, i’m french.

Something on your machine leaks memory.
You need to have your system checked and troubleshot.

P.S.
Try a flight with completely empty Community folder and no other apps running (be it addons or whatever).
See how it goes.