perf.txt

vectorz:
                            n=5: : 266.523286 ns
                           n=50: : 156.841570 µs
                          n=500: : 281.972092 ms
                         n=1000: : 8.218981 sec
persistent vectors:
                            n=5: : 69.954376 µs
                           n=50: : 34.461107 ms
ndarray:
                            n=5: : 15.065835 µs
                           n=50: : 12.664603 ms
ndarray-double:
                            n=5: : 3.023046 µs
                           n=50: : 298.927974 µs
                          n=500: : 369.020215 ms
                         n=1000: : 2.285054 sec