Um where you're describing context tree you say that root MOC has main queue concurrency and then that main queue has private concurrency, which is wrong. The p

Um where you're describing context tree you say that root MOC has main queue concurrency and then that main queue has private concurrency, which is wrong. The picture is right That said I agree on conclusion, I started my first (quite big) core data app constantly worrying about performance, so I juggled all kinds of MOCs around, but then I just threw all of them out, start with a single main queue MOC and only add private queues where absolutely needed.