[SDL] simple questions about 2D performance / hardware acceleration

[jeroen clarysse]

I'm still a bit confused about the hardware acceleration when it comes  
to blitting in SDL...

is it true that the Windows Version uses DirectDraw and therefore  
accelerates 2D blitting ?
is it true that the "ordinary" Mac version does NOT use openGL and  
therefore does NOT accelerate blitting ?

how big is the speed difference on mac between plain_SDLand  
SDL_with_openGL when it comes to 2D blitting ? On a modern CPU/GPU, is  
it worth the effort ? Or is plain_SDL already within 1msec for a  
fullscreen blit (1024x768) ?

I sincerely hope someone can shed some light on this