Visual Studio: the mouse cursor flickers between the correct cursor and the hourglass. How to get rid of it?

Q. Visual Studio: the mouse cursor flickers between the correct cursor and the hourglass. How to get rid of it?
A. Close all your previous opened documents (pages). Too many opened pages are heavy for your Visual Studio processes. Each computer (depend of the CPU speed) has the different number of the opened pages without flickering of the mouse pointer.