24bpp and 32bpp is slow!! :(((

Hi! I’m from Spain and my english is very bad. I’m sorry.

Why my program run slowly in 24bpp or 32bpp?
In 16bpp run fine.

I have an ATI Rage Xpert@plu98

I don’t understand
Help please!!!

It is probably because your hardware/device driver only supports “acceleration” in 16bpp