Does having multiple windows open cause the fps to drop

Development Rendering
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1

I use 5 monitors!

When I open a new barand project, with Quixel bridge open and the content browser on the second monitor, I get 120fps

And when I open the mesh editor and the blueprint editor on the 3rd or even 4th monitor, the fps drops from 120 to 70-80.

Is this normal? Is it because my GPU has to calculate what is in the Viewport (on one monitor) and also what is in the Mesh editor (on another monitor)? So it has to do it twice?

Thanks!