Note: It shows the delay time between each image frame in the speed figure window, units are in milliseconds. So it is normal for the figure to go up when you hit the button and figure goes down when you hit .
We recommend you us the   and   buttons to change the figures in the figure windows, in case you really want a big jump right away, please always keep in mind that you will have to hit one of the   buttons to make your new setting work. It is the limitation of the html.
There is no upper limit verification of the End Frame just to keep the flexibility of the viewer, please note that when the figure goes beyond the exist of the frame number, the image viewer will show blank image in the image display window.