Slow Core-Data fetch operation, with readonly sqlite database - ios

Question

Core Data fetch operation is slow with a Read-only sqlite database. Can I improve its performance?
Background: I have a core-data model with 2 configurations. One for the default application store, and another for seed-data (SeedData.sqlite). The SeedData.sqlite is placed inside the application bundle, and is setup as a Read-only store. The SeedData.sqlite contains approximately 6500 records.
This is how I setup the persistent store:
// Returns the persistent store coordinator for the application.
// If the coordinator doesn't already exist, it is created and the application's store added to it.
- (NSPersistentStoreCoordinator *)persistentStoreCoordinator {
NSLog(#"%s", __FUNCTION__);
if (_persistentStoreCoordinator != nil) {
return _persistentStoreCoordinator;
}
// Attempt to load the persistent store
NSError *error = nil;
_persistentStoreCoordinator = [[NSPersistentStoreCoordinator alloc] initWithManagedObjectModel:[self managedObjectModel]];
// Create the default/ user model persistent store
{
NSString *storeFileName = [JTCoreDataManager defaultStoreName];
NSString *configuration = #"AppName";
NSURL *storeURL = [[self applicationLocalDatabaseDirectory] URLByAppendingPathComponent:storeFileName];
// Define the Core Data version migration options
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
nil];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:configuration
URL:storeURL
options:options
error:&error]) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]);
abort();
}
}
// Create the seed data persistent store
{
NSURL *seedDataURL = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:#"SeedData" ofType:#"sqlite"]];
NSString *configuration = #"SeedData";
// Define the Core Data version migration options
NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
[NSNumber numberWithBool:YES], NSMigratePersistentStoresAutomaticallyOption,
[NSNumber numberWithBool:YES], NSInferMappingModelAutomaticallyOption,
[NSNumber numberWithBool:YES], NSReadOnlyPersistentStoreOption,
nil];
if (![_persistentStoreCoordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:configuration
URL:seedDataURL
options:options
error:&error]) {
NSLog(#"Unresolved error %#, %#", error, [error userInfo]); abort();
abort();
}
}
return _persistentStoreCoordinator;
}
The fetched results controller is setup like this:
NSFetchRequest *fetchRequest = [NSFetchRequest fetchRequestWithEntityName:#"Seed"];
NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:#"title" ascending:YES];
NSPredicate *predicate = [NSPredicate predicateWithFormat:#"magicOn == %#", [NSNumber numberWithBool:YES]];
[fetchRequest setPredicate:predicate];
[fetchRequest setSortDescriptors:#[sortDescriptor]];
[fetchRequest setFetchBatchSize:20];
NSFetchedResultsController *fetchedResultsController = [[NSFetchedResultsController alloc] initWithFetchRequest:fetchRequest
managedObjectContext:self.managedObjectContext
sectionNameKeyPath:nil
cacheName:nil];
NSError *error;
BOOL success = [fetchedResultsController performFetch:&error];
if (!success) {
NSLog(#"%#", [error localizedDescription]);
}