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The real downer is the lag that occurs when zooming, as it takes the software a second or two to rerender the text and images. This would make it difficult to pinpoint a specific part of a document by sight, but for most other reading tasks it does just fine. Part of the reason for that is that the software only renders around four pages of a long document at a time, and will load in the rest when you stop. A 12MB, picture-rich PDF file we had downloaded in Android's stock browser opened up in just four seconds and zipped around like butter on a hot pan.
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We found it to work quite well, even on large files. It packs in multitouch gestures for zooming, landscape orientation, and a tool that will resize the text on wide documents to fit your phone's narrow screen.
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Adobe's PDF Reader predictably lets Android owners quickly open PDFs that they've downloaded from a browser or have received in e-mail attachments.
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