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Core data Performance on ios 5

edited November 2014 in iOS Devlopment

Hi everyone,

I need to optimise for core data on ios 5 device. Although it is fast on ios 6 and above, it is very slow on ios 5 device. I saw log like this.

CoreData: annotation: total fetch execution time: 1.0510s for 11 rows.

May I know what is wrong with my codes? Is there other good way to optimise core data performance on ios 5 device?

- (NSArray *)getBusServiceAtBusStop:(NSString *)bus_stop_id
{
    if (!bus_stop_id)
        return nil;
    
    NSFetchRequest *fetchrequest = [[NSFetchRequest alloc] init];
    NSEntityDescription *entity = [NSEntityDescription entityForName:@BusRoute
                                              inManagedObjectContext:[self managedObjectContext_busroutes]];
    [fetchrequest setEntity:entity];
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@bus_stop_id == %@", bus_stop_id];
    [fetchrequest setPredicate:predicate];
    
    NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@bus_service_num ascending:YES];
    [fetchrequest setSortDescriptors:@[sortDescriptor]];
    
    NSError *error = nil;
    NSArray *arr = [[self managedObjectContext_busroutes] executeFetchRequest:fetchrequest error:&error];
    
    if (error)
    {
        DLog(@Error: %@", [error localizedDescription]);        
        return nil;
    }
    if ([arr count] 

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