I have problem with unlocking of my machine running Ubutnu 16.04 LTS. It's almost fresh installation (few weeks old) and I have problem with really slow unlocking (tens of seconds). I have enabled scaling in Settings - Displays by setting Scale for menu and title bars to 0.875 and I think it is cause of my problem.
When I lock my computer, the lockscreen is scaled as expected, but if I leave computer for some time and return back, lock screen sometimes resets to original scaling and during unlocking, it scales back to my value 0.875 and I think it causes my problem. Why scaling sometimes reset for lockscreen? Could it be a bug in Unity/Ubuntu?