Stellar Viewer
This reader is superb. I dont use the Drop Box, but purchased the full version anyway......I was testing pdf readers for my daughter who has 100+ page documents to read for college. I was impressed and purchased the "reader" version for her. After an approx. 3 minute rendering, her files were easy to read page after page with no screen recalculating. I use this app myself, recently viewing multiple page home insurance quotes. Zooming and scrolling the documents are instantaneous. Ive used this app to view 11x17 spreadsheets, again with instantaneous views as I zoom and scroll through parts of the documents.
Tech support is superb. I received an email reply within an hour. This was a Sunday evening. My query had revealed a slight bug in the program, it was promptly addressed, added to the recent update, and followup emails kept me informed.
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The Fastest PDF Reader