[SDL] SDL_CreateRGBSurface

[Paulo Brandao]

I have used two methods to splilt a large image loaded from disk(whith 
sprite images) into various frames of my SDL_Surface frames array. The first 
one I create a empty surface whith SDL_CreateRGBSurface whith dimensions of 
frames. Then i blit the large image with the calculated offsets in this 
image, after this i use SDL_Display format to past the image for a element 
of my array.
The second is to load a template image with frames dimensions from disk, 
blit the larger image, then past it for my frames array.

The first method, using SDL_CreateRBGSurface slow down the animation, why?

thanks
Paulo