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There is no trick. A document or book that is in the back ground simply opens faster (almost instantly), while a book that is not in the background takes a few more seconds to open. I mostly see a "please wait" window pop-up in that case. This pop-up window is not there for the last 4 documents that I have opened.
If you sort your books on "recently read", you can easily see which ones are still in the back ground memory... you'll notice that if you open the fifth book on the list, it will have the "please wait" pop-up window. The fourth book opens instantly...
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