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I can send you a special version with extra cache memory allocation. You can then tell me if that makes any difference.
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Thanks for sending me the experimental versions.
My observations:
So little difference between any version that I tested using the 6, 9 and 12 versions.
1)Scrolling continously as pages render: same, slow speed allowed by each version.
2)Page rendering: tested by wating till a page has loaded then scrolling a whole page length quickly into black space and timing the render. In all cases 4-5 seconds (roughly a second per quarter).
3)Flinging: not sure this is much use but was the only thing that changed radically between versions. After scrolling down through a number of pages I try flinging the pdf back and forth. Version 6 allows about 3 pages while version 12 will comfortably do 6.
Rendering occurs only with what's visible on screen. That is if a sliver of the top of the following page is showing as I read a page, when I scoll down, half the next page will be rendered (the two top quarters).
I've come to the conclusion that the mag I'm using for testing is seriously heavy. ezPDF takes a few seconds to turn the pages with the same mag and other, similarily graphic intense mags in your app are a lot quicker, rendering as I'm scolling in 1-2 seconds.
For a test I tried the Skip Images setting which resulted in blank, white pages. Although I could scroll down pretty fast, after a few pages, I could still see the individual quarter pages being rendered.