One great thing about the 4.0 reader: the new cache is amazing.
I have a fairly large reference book I use a lot. Previously, it took about 25-30 seconds to open (I believe calibre scans the entire document to get a page/word count). Now, the first time I opened it took about that long, with the "opening for the first time..." message. But subsequent opens take just 2-3 seconds, unless I've updated the book.
I no longer have to leave it open all day long, or wait around for it to parse.
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