There are zero FPS issues when flying the Fenix with Ryzen 5 2400G Vega 11 iGPU.
There is no difference when choosing the Fenix compared to for example choosing the GotFriends Glider or the Cessna 414.
But! Some of the add-on airports are absolute to avoid… oh wow I can almost hear the dia-projector slide noises while having 1 - 5 FPS. But this is happening with all airplanes on specific DLC aiports so it´s an airport issue.