Is it normal for the frame rates to jump all over the place while flying in FS9? Mine will go from 2 to 70 or 80 in a matter of milliseconds. Is that normal 😕
Yes, it's fine. Mine do the same.
I think Clouds have a lot to do with that, and then traffic, and I suppose if you have add on scenery, in certain areas it could make it change. But I think clouds have the most to do with sudden changes in frame rate.
Even the plane you are flying may have heavy textures that are slow to load when you change views.