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The display of the DR1000 is about four times larger than the Astak's so it's not surprising that the rendering and updating takes longer. Reflowing PDF might seem straightforward but reformatting a paged based layout of such a complex file format is not exactly trivial. As far as I know, only the Adobe engine can do that, so I presume Astak uses it (as does DR800). It 's also a whole lot faster than the open source PDF renderer used by DR1000.
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