A method of operating a data processor when rendering a sequence of frames to produce a sequence of frames for display is disclosed. Each frame represents a view of a scene of one or more objects. The motion of one or more objects is tracked between frames in the sequence of frames. When data for a new frame in the sequence of frames is to be rendered, for a region of the new frame, the method involves determining, based on the tracked motion of one or more objects between frames in the sequence of frames, an amount of motion within the region between frames. The amount of motion is used to assign the region to a category of no, low, intermediate, or high motion. A rendering technique is selected for rendering the region based upon the category to which the region is assigned.