I was advised to use GLUT and now I go to a new level of video demonstrations - not just high-quality (lags / not lags), but quantitative (in FPS).
A classic theme without a Radeon driver (Standard VGA Graphics Adapter).
Desktop: FPS = 850-900
Viewing the Spectrum foobar2000: FPS = 800-850
Scaling in P-CAD: FPS = 750-850
A classic theme with the Radeon driver installed.
Desktop: FPS = 1050-1200
Viewing the Spectrum foobar2000: FPS = 35-50
Scaling in P-CAD: FPS = 10-1050 (huge drawdowns from 1050 to 7-12 FPS)
For 2D mode, "Standard VGA Graphics Adapter" works 10-50 times faster, than the radeon driver!
Video demonstrations will be!