Simple Core Data example showing how long it takes to create 10,000 records and then update those records.

gistfile1.txt

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    NSURL *db = [[self applicationDocumentsDirectory] URLByAppendingPathComponent:@"TestDB.sqlite"];
    [[NSFileManager defaultManager] removeItemAtURL:db error:nil];
    
    NSManagedObjectContext *moc = [self managedObjectContext];
    
    NSLog(@"Creating Entities");
    
    for (int i=0; i<10000; i++) {
        MyEntity *entity = [NSEntityDescription insertNewObjectForEntityForName:@"MyEntity" inManagedObjectContext:moc];
        entity.name = [NSString stringWithFormat:@"Entity-%d", i];
    }
    
    NSError *error = nil;
    if (![moc save:&error]) {
        NSLog(@"Error: %@", error);
    }
    
    // Flush the context, so that fetching all the entities will have to hit the database
    [moc reset];
    
    NSLog(@"Created and saved 10,000 entities");

    NSFetchRequest *request = [NSFetchRequest fetchRequestWithEntityName:@"MyEntity"];
    request.includesPropertyValues = NO;
    NSArray *objects = [moc executeFetchRequest:request error:nil];
    for (MyEntity *entity in objects) {
        entity.read = @YES;
    }
    
    if (![moc save:&error]) {
        NSLog(@"Error: %@", error);
    }

    NSLog(@"Updated 10,000 entities");

    // Override point for customization after application launch.
    return YES;
}