I'm updating an old project that was built long ago, skipping udpates for iOS 5 & 6. One of the things my app does, in an NSOperation, is call -performSelectorOnMainThread: (waiting until done) as it integrates downloaded data into the Core Data store (Core Data operations all happen on the main thread).
In iOS 6, this can bring the app to a grinding halt, despite the fact that each record integrated is done as a separate -performSelector call (I would've thought that'd let the main thread handle user events). In iOS 7, it actually works really well, leading me to believe something changed in the way this is handled. Any insight? Thanks! -- Rick
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