> My component uses scaled images which cannot be correctly rendered partially, 
> so the entire scaled image is redrawn every time the viewport changes which 
> happens dozens of times when the user scrolls by dragging the scroller. think 
> that user experience would be significantly improved with an algorithm that 
> proactively drew the contents of the viewport in an offscreen buffer when the 
> user scrolls in a given direction, which is closer to 
> BACKINGSTORE_SCROLL_MODE. I mean, my iPhone scrolls better :) 

Agreed:

https://issues.apache.org/jira/browse/PIVOT-454

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