NSMutableDictionaryの適切でない使い方 ref: http://qiita.com/AyatoKinkori@github/items/33dfae4dbccd12b07d88

example01.c

NSMutableDictionary *mutable_dic = [[NSMutableDictionary alloc] initWithCapacity:2];
//辞書の生成
int i;
for (i = 0; i < 100; i++) {
    NSDictionary *dic = [NSDictionary dictionaryWithObject:@"hoge" forKey:@"Key"];
    [mutable_dic addEntriesFromDictionary:dict];
}