Do you have any example or code? That is fairly wild for me
I posted link in first topic
If what you said is true, then it's related to OS not Java. OS has duty to split processing cycling duty for each application. On some HW acceleration enabled program like game, putting them to background will decrease their share. I forget what this is called for.
I think you can be right, that's why I gave you information about my OS.
I record this video. Now it should be clearhttp://www.youtube.com/v/J8SBjKncgRw?version=3&hl=en_US&start=