Can someone do a test(check the CPU usage)

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I just want to know if it's a problem with the emulator or it's something here.

When I play a game,if I minimize the emulator,the cpu usage goes at least +20%
For example,start FF7CC,load a save and check the cpu usage when when Zack appear.
Now minimize the emulator and check the cpu usage again.

Here when not minimized(or the window is not active),the cpu usage is 25% and when I minimize it 50% and more(when I restore the window,it goes back to 25%).
It happens on any game and the cpu usage if always different between minimized and not