My not so WAG is that the newer code draws MUCH less then the old approach. i.e. All of the 2D Panel was drawn as was all of the scenery that it obscured. In the new approach SSG is clipping those instruments not seen and the occluded scenery is not drawn. Note this includes the scenery occluded by the rest of the planes interior too
We're talking about using the old (2D) panel animation code inside a 3D cockpit, where the panel itself is a 3D object behind the instruments. The amount of scenery visible in the 3D scene graph is exactly identical (take a look at the default 172p, which uses the old 2D panel code).
FWIW That PLib's Font routines are quite efficient is amply demonstrated by the minimal hit drawing the HUD has on the FPS
That's worth keeping in mind, then.
All the best,
David
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