Disable screen saver - %ns
%ns is designed to cause screen saver activity to be inhibited while the window
is open. If your application opens a window and then performs a long
calculation, there is a danger that a screen saver will cut in when your
program yields, even temporarily. This is because the operating system
considers the system to be idle if there is no input for a set period of time.
Many screen savers are very CPU intensive and will starve your program of CPU
resources. Use %ns to eliminate this problem.