How to delete calendar events faster?

Question

Following code works and deletes all calendar events from iPhone calendar database. But events are deleting very slow: 2 events per second on iPhone 3GS. So if you have 3000 events - then it's 25 minutes to erase them... How would you optimize this code? Maybe I am doing something wrong? Thanks.

- (void)deleteAllCalendarEventsFromIPhone:(NSError **)error {
    EKEventStore *store = [[EKEventStore alloc] init];

    NSUInteger beginYear = 1900;
    NSUInteger endYear = 2100;

    while (beginYear < endYear) {
        NSPredicate *predicate = 
            [store predicateForEventsWithStartDate:[self createDateWithYear:beginYear month:1 day:1] 
                                           endDate:[self createDateWithYear:beginYear + 4 month:1 day:1] 
                                         calendars:nil];
        NSArray *eventList = [store eventsMatchingPredicate:predicate];
        for (EKEvent *event in eventList) {         
            success = [store removeEvent:event span:EKSpanThisEvent error:nil];
        }
        beginYear += 4;
    }
    [store release];
}

Answer 1

Maybe because it is not the usage of EKEventStore !
Removing all user event is quite dangerous ...