Where I really notice it is when I use the "big red pointer" mouse pointer set. This is a set of mouse pointers that are large and red for those that have vision issues or just have issues trying to find a small mouse pointer on a very large screen. When using any of these optional pointers, I see the flash at 10/15 and on some of them I get a double pointer.
I'm not sure why JTAlert would have any need to manipulate the mouse pointer.