Importing 4GB of books requires 8GB+ of space. Why?
I've noticed a peculiar thing. Calibre, when importing, first copies all the files to a temp folder (on my machine it's /var/folders/ys/mk3r41nj2jv20t0cw7_f_tvw0010gn/T/calibre_0.9.22_tmp_fOK9I5/ ) and then it copies files again to Calibre Library folder (it doesn't do a mv). Then it deletes files from temp. Why is it doing this? It's so inefficient and slow. It took me forever to import these books and majority of time was spent on I/O operations.