@Cool_amigaN Quote:
Is this performance difference from windowed to fullscreen normal?
I'm not sure whether doubling the FPS is normal, but certainly full-screen is more efficient than window mode, as there is no need to perform window clipping on all graphics operations. OTOH, compositing should remove the need for window clipping... but it might have other overheads.
I'm not sure exactly how compositing is implemented, and whether it could impact graphics performance in window mode. Running stuff in full-screen can (IIRC) automatically disable compositing on that screen.
Try running in window mode with compositing disabled, and see if it makes any difference.