Modern video processors are specialised and extremely fast, designed for gaming animations. They can generate images, and shuffle pieces around, inserting offscreen regen-resident images. Java’s VolatileImage class let’s you put offscreen images inside the hardware regen buffer then blast them onscreen much faster than usual. The super-fast, wide-path video processor moven the bits which are already in the regen; they don’t have to be brought it from the outside standard RAM.