I'm experiencing some keyboard lag on my NSPredicate search:

some code:

- (void)filterContentForSearchText:(NSString*)searchText scope:(NSString*)scope
{

    NSPredicate *resultPredicate = [NSPredicate predicateWithFormat:@"(head beginswith[c] %@) OR (pro beginswith[c] %@) OR (searchableStringValue beginswith[c] %@)", searchText, searchText, searchText];

    searchResults = [chengduhua filteredArrayUsingPredicate:resultPredicate];
}

&&&&

-(BOOL)searchDisplayController:(UISearchDisplayController *)controller shouldReloadTableForSearchString:(NSString *)searchString
{
    [self filterContentForSearchText:searchString
                               scope:[[self.searchDisplayController.searchBar scopeButtonTitles]
                                      objectAtIndex:[self.searchDisplayController.searchBar
                                                     selectedScopeButtonIndex]]];
    return YES;

}