When new nodes are added, only the newly formed or modified loops will be redrawn. If the new nodes can be placed without creating too many disturbances to the loop, the overall configuration will stay the same. However if the new nodes generate important modifications to the loop structure, the layout may change radically. If a redraw is toggled with no new nodes, the energy algorithm will try to improve the layout of each loop (assuming the "fast" option is off ; if the "fast" option is on, the result will be the same).