I have outsourced PFD and ND to another monitor. If I click with the mouse in the screen with the outside view, the FPS go down. If I click on the monitor with the PFD / ND, the fps rise again. Has anyone noticed that too?
I have seen the same thing on my monitors
It’s most likely reporting the FPS of the screen which currently has the focus.
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This.
In any case, as much as I’d like to use my extra monitor, every window I pop out from the main game window costs me about 5fps. Too expensive for my liking.