Dear @chaley,
, maybe my English is not good enough to express what I wanted to say or what I saw. So I made two screenshots, hoping they can be more meaningful.
Very often, when I open CC (I'm testing so I do open it a lot - Calibre main program too), this happens and I have to wait. I'm sure the changes made in Calibre database is trivial - nothing special, one or two words in comment field of a book.
I think it is not convenient, as a user.
http://i.imgur.com/kNoVqqZ.png
My search is also quite simple, nothing fancy. Just one word "Marple" and the process looks like this
http://i.imgur.com/rDkXtAb.png
I'm not at a position to comment on how technical things should be made, just mere user experience.
.
I will try Box, too. But I have problem with Box before because Box tended to keep a copy of the modified files (folders) which make the whole set of database bigger than needed.
Ooof. The pictures are so big