Ah... OK but keep in mind you are still drawing all of the Panel even if it is not all in view, this includes all of the 'state changes' taking place in the 2D code that aren't necessarily happening in the 3D code and SSG might also be smart enough to optimize some of these 'state changes' to no-ops or at least minimal-ops. AFAIK the 2D code doesn't do any 'OpenGL state' optimization.
Yes, that sounds more likely.
All the best,
David
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