Hm, I don't think this is a good example if the point is to talk about general graphics slowness, because the slowness here is not due to generic graphics issue

Hm, I don't think this is a good example if the point is to talk about general graphics slowness, because the slowness here is not due to generic graphics issues. This is slow because each pane is running in its own process and it's doing some complicated cross-process graphics stuff to get all the drawing into the same window. This changed in… maybe Lion?