Slowdown and lost windows when connecting/disconnecting external monitor When I connect my external monitor, my 2017 MacBook Pro (OS 10.15) will freeze or have severe slowdown for more than a minute. When disconnecting, I often lose windows that I can't recover through any known means except reconnecting to the monitor. Is there a way to reduce the slowdown and have it properly move external windows back to the built-in display?
The monitor is an older SyncMaster using a USB-C -&gt; DVI connector.
In the Display settings, under the &quot;Arrangement&quot; tab, I had previously dragged the menubar to the external monitor. This had some benefits, such as causing the Application Switcher to appear on the external monitor, which is the one I was usually looking at. However, moving the menubar back to the built-in monitor eliminated the problems I was having. There is now no slowdown when connecting, and when disconnecting windows reallocate themselves between monitors as expected.