Hello, i got this problem in my scene if want to adjust camera location it just lags and slows down i cant even lock camera to view to adjust camera.
while it is just normal when navigating inside my file or moving a non active camera
Well… this heavily depends on the scene… the viewport settings… any additional things attached to the camera movement… etc. …
…so for this general question there could only be a general answer… or some suggestions like: try solid view… 
I’m already on solid view and nothing is attached to the camera or vice verse, my trouble is that i can move inside the scene easily in the viewport but when moving the camera even if im not in camera view the scene lags it is hard to to adjust camera location because of this.