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I have to agree with matt on this. I am looking for a PDF utility, and great viewing performance is the most important feature. All the other features are meaningless if its sluggish just looking at the PDF.
I have been looking through some reviews, and this keeps cropping up, for example, in an otherwise glowing review for PDF Expert,
http://cynicalbabblings.wordpress.com/2012/04/05/pdf-editing-apps-2012-review/
" iAnnotate does not lag when zooming in and scrolling around the document
Goodreader & PDF Expert has a delayed reaction, especially around pdfs with graphics "
For $10, can we get the absolute fastest app?
they all lag. in my informal tests, pdf expert lags a little more than iannotate, but we're only talking about a second or two, and it is much faster than some of the other apps out there. i'd really like an app that is blindingly fast, even if it doesn't do much else