When I migrate my core data database, all tables data is reinserted ?

I've created a new database on iOS, with a small change in a table and mapped to the previous one. However, looking at the log, it seems that all data is reinserted. Consequently, the migration is very slow.
In the log file I can see that all the tables are created again and data is inserted (check for CREATE TABLE, INSERT statements):http://cl.ly/3H1v252R1p1c
any clue why my database is slow ?
I've also checked this line in the log file: pragma auto_vacuum=2. So i've changed the pragma options to set it to 0. The property log is correctly updated, but it seems it wasn't the problem.
thanks

''philipp [[#answer-709014|said]]''
<blockquote>
hi, maybe the following article can give you some more clues: [[How to stop Firefox from automatically making connections without my permission]]
</blockquote>
Thanks for the link but I tried everything on the page and the delay is still present. Also, the delay is a bit longer than I thought. It's usually 20 seconds.

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When I migrate my core data database, all tables data is reinserted ?

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