maybe the file itself. but what R2D2 would like to see is pregenerating the Bitmaps readily for putting them to the Display/e-ink. And that will probably need some more space then only some MB of the PDF/document itself.
Loading files into memory seems to be common in Linux/unix-derivatives. I have been told that there should have been cases where harddrives of a server died but it kept up and running cause it had all needed files cached in memory. I have not verified that.
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