Yes. They are extracted from larger textures.Hmm, do you have each tile in a separate texture?
Yes. This should be apparent from the posted code.Do you update all the vertex positions when you do the scrolling?
This revised function was not the one suffering from speed.Those two things look a little fishy to me, perhaps that's why you have had problems with speed?
You don't understand *pSVB++?
Now that's fishy.