Hi Pete,
yes, unfortunately I can confirm the fact.
In June 2020, Roger contacted me via e-mail about the frames in his Gander scenery - had well had heard, that if a scenery runs on my museum computer, it will run on every other FS9 machine in the whole wide world.
I told him that I got around 10 fps. He answered that he had used an old fashioned way to design his sceneries with SceneGenX. The only way to fire up the frames would have been, to redo all the work in another program from scratch - but the motivation doing that was not so high from his side. As most people uses much faster computers these days for to run his sceneries, he decided to leave it this way.
So we have to live with it... or delete it.
Dedl