In Full Screen mode my game stutters when I move the camera so I play in Borderless Fullscreen

The problem is that when players appear or I load assets when I advance in any area.. my performance starts to decrease.. and I'm forced to Alt+Tab to fix it

The game has a really smooth camera movement in Borderless Fullscreen but my performance starts to decrease after a few minutes of gameplay.. the thing is that if I Alt+Tab my stutters goes away but after a while this reapeats over and over

Any fix.. workaround?

Thanks in advance