I have the same problem as described in the first link: The stroke only appears on the second screen after I stop holding down the mose button or after taking the pen off the screen.
Turning off hardware acceleration did not help, as in the last reply to the second thread. The presentation view has still this delay (I would not call it lag, as it is not lagging but simply not appearing before the stroke is released) in the writing and shows only stroke-by-stroke while the presenter's view shows smooth writing.
I am also using Powerpoint 2016 on Windows 10.
Any other suggestions?