CC2017
When I command+W and try to scroll up and down with the arrow keyes it takes forever and its inconstant. Basically its not working at all.
I just bought the new MacBook Pro 2017 with macOS Sierra 10.12.5.
I restarted laptop and it continued to make the same.
In my other Macbook air, it works just as fine.
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Marta Law
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RY commented
Do you have high quality preview turned on?