Abstract: The invention provides method and associated processor for buffer swap which swaps a plurality of buffers to respectively be a front buffer and a number of back buffers, enables a frame drawn to the front buffer to be read, and draws another frame to one of said back buffers. The method comprises: iterating a procedure for drawing each one of a sequence of frames, wherein the procedure comprises: selecting one of a plurality of swap behaviors according to input data, and performing the buffer swap by the selected swap behavior.