Hi,
You could point all the points in one iteration and change their locations in the next second. So suppose you plot 60 points in first second, then you could update the position of the first 60 points so that they match the next 60 points. You could do that by changing the XData and YData properties of the plotted points. For the second query, you could use the line "axis off" to make sure that axes aren't drawn on the image.
Refer to the following link for more information on plot properties
