Since update 5, i.e. since I bought the game when it was released on Steam in August until before update 5 I have not had any problems.
Since update 5, there have been several crashes that obviously destroy my flight, I have significant performance losses when I turn the camera sideways and I also see that the objects or textures load later which causes them to appear sometimes out of nowhere.
Have I gained frames with udpate 5? Yes, but at the cost of losing lateral fluidity, stability and the desire to fly.
I don’t have anything external, I only have the intermediate version of mfs installed, all updated.