Game running on background looks laggy and low fps

So I am developing a multiplayer game and I generally need to run multiple simultaneous instances of it for testing.

The current foreground window, the active window is the one that's gonna run at the most frames per second, while the other ones will be way lower, even lower than my monitor Hz.

If i click anywhere on the desktop to de-select the window, all windows will appear to get the same FPS but still far from native performance. Almost like windows thinks they are not important, they look really low fps despite showing close to 200+

is there somewhere i can change that?

 

This might be what you're looking for? From what I read it seems like it's something your computer does, not Unity.

https://forum.unity.com/threads/unity-editor-performance-drop-when-losing-window-focus.518761/

 

So is there a windows setting to change that? In the meantime I am putting all windows at 60 FPS to mitigate the issue and it seems to work better.