Gentlemans, OP said that JSBSIM Canadair Tutor has 1 fps, YASIM Canadair Tutor has 30 fps. How can in both cases installed same OSG or GPU driver drastically affect framerate ?
IMHO, problem is somewhere in the JSBSIM libs, I recommend full reinstall FGFS.
Well, let's put it bluntly, you're going to have a hard time convincing anyone of a theory that blames JSBSim for a rendering issue - for the simple reason that JSBSim doesn't do any rendering, doesn't call any rendering routines and... doesn't even know that rendering exists (you can run JSBSim as standalone simulation framework using the same libs).
So nobody of the JSBSim developers is going to investigate rendering issues inside JSBSIm - because conceptually they can't exist (and, well, aren't seen by anyone else).
Thus eliminating the impossible, we can deduce that what remains, no matter how far-fetched, must contain the truth of the affair.
Now, it often is the case that
a) aircraft have vastly different complexity
b) complex aircraft tend to use JSBSim for FDM and systems because it actually allows complexity whereas YaSim kind of limits it
c) aircraft which get the care to have complex FDMs often also get care with effects and rendering
Of the list in the initial post, I'm only familiar with two craft - the C-172p and the Bristol Freighter, but they show the expected vast difference in complexity. The Bristol Freighter is a straightforward YaSim model with a 3d model an no fancy anything, the C-172p is a top of the line aircraft maintained by a team which makes sure it has all the latest and greatest - like damage simulation, different configurations, detailed glass reflections, lightmaps,...
So there's several reasons why these two craft should show drastic framerate differences. I'm also betting that the Space Shuttle will render slowly - but I'm fairly sure that has little to do with JSBSim as such either and mostly is the systems simulation.
Now - what about the same craft in Ya vs. JSBSim? I'm not familiar with the example, but often an aircraft is started in YaSim and when somebody decides to really work it out it is ported to JSBSim - it so happened with the F-14b which grew a lot in systems and damage complexity when Richard made a JSBSim version.
So likely that is what we're seeing here - the system can handle average aircraft fine, but top of the line craft are too much.
(P.S.: The plural of 'gentleman' is 'gentlemen' - the phrase 'ladies and gentlemen' is actually very common and worth memorizing)