FrameRate drops when opening a window

When i open a second window the frame rate drops dramatically, even on the startup project when i press view on any of the operators the frame rate drops from 60 to 45. on other projects that i open Window comps the frame rate drops from 60 to about 5.

My machine is strong (i7 7800X, GTX 1080Ti) so that’s probably not the problem here.

Thanks to Devid Leroy problem solved.

Geforce experience is our enemy! I uninstalled it and TD runs like new!