I have updated to latest windows 10 creators update (fresh install) and the latest drivers 17.4.2. If you open Word 2016 or excel or other when you change the window size to a smaller window and you try to slide the window it moves slow. My graphic card is a Saphire Radeon RX470.
To reproduce it:
1. Open Word 2016 and open a new white document. (If you don´t open a document all works OK)
2. Minimize the window and slide it through the desktop (you will see a slowdown in the movement of the window)