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Originally Posted by bluexp
There is a row under top large buttons (with a red heart at right) which is totally useless I think.
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By default it only has the main Calibre Library icon. However when you plug in your device additional icons appear for the devices internal memory and any plugin cards. You then select the one you currently want to operate on.
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There is a strange thing I found while using Calibre. There are 4 runing task with name "calibre-parallel" and another one with name "calibre". these tasks totally use something around 135MB of ram which I think it is really much (I have book label which uses only 30MB of ram). and I don't know why there is so much task for one running application.
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The Calibre task is the one that controls the GUI. The other one are sub-tasks to run things in background threads. The number of the calibre-parallel tasks started depends on the number of processors/cores in your machine. Part of the reason for this approach is that Calibre is written in python and having the tasks already running avoids the large startup delays python tends to introduce. It also probably explains why Calibre uses a lot of RAM - but that is cheap and plentiful on modern machines.
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Finally I would be more happy if there was possibility of adding book to database without moving them to library folder.
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There have been many discussiosn about this. At the moment Calibre treats its own library as a "Black Box" into which anything it is working on is copied, and this will not change without some fundamental re-writing. Therefore it certainly will not change in the near future.