怎么加快 h5py 的写入速度？

with h5py.File(os.path.join(args.data, f'{args.city_name}.h5'), "w") as f:
    f.attrs['num'] = len(routes_valid)
    f.create_group('/trips/coord')
    f.create_group('/trips/osmid')
    f.create_group('/trips/length')
    for i in range(len(routes_length)):
        f.create_dataset(f'/trips/coord/{i + 1}', data=np.array(routes_coord[i]))
        f.create_dataset(f'/trips/osmid/{i + 1}', data=np.array(routes_valid[i]))
        f.create_dataset(f'/trips/length/{i + 1}', data=np.array(routes_length[i]))
        i % 5_0000 == 0 and print_time(f'saved {i} trips')

大约有 150w 条数据，后面速度变得巨慢无比。