IOS CoreData: NSFetchedResultsController performances?

What's happening is the fetched results controller sees the change notification when you update the managed object, and it has to figure out what index that object was so it can tell its delegate that the object was updated. To do this, it's going through all the batch selects again until it can find the right one. I'm not sure why it can't just have this information cached, but obviously it isn't.

Have you tried adding a section cache to the fetched results controller? That may possibly speed things up (depending on whether or not the fetched results controller uses that cache in this instance). You do so simply by specifying the cache name when you call -initWithFetchRequest:managedObjectContext:sectionNameKeyPath:cacheName: .

First, I would suggest to avoid showing to the user a big table with 17K records; instead you should allow the user searching for records and then selecting one of the search results. Anyway, if you want to allow the user selecting a record directly from the big table, you need to think about the fetching process.

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