I'm developing an ios app using restkit and core data to query json from a server.
I noticed that the first time I open the app, restkit works properly, but the second time, it refuses to load any data.
When I enabled the restkit trace log, I saw that restkit printed lots of "skip mapping / no data change" message, and this takes a very long time.
What does that message mean? Why does it take so much time?