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Johann-
The scrolling playback feature is directly related to the video card.
Have you updated the drivers for your video card and soundcard(while you are at it)?
Ideally you should defrag your harddrive much more than once a year. There is no reason not to defrag at least once a week.
Finale is complex software that is taxing on a system - it will only perform as well as the system that it is asked to perform upon.
As far as Sibelius vs. Finale - I have used both. Like any software there are unique Sibelius issues that you would encounter.
There is no such thing as perfect, bug-free, software.
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