with length()
        1000 L=    256000 t=0.510602
        2000 L=    512000 t=1.544809
        3000 L=    768000 t=2.558511
        4000 L=   1024000 t=3.598220
        5000 L=   1280000 t=4.622924
        6000 L=   1536000 t=5.666133
        7000 L=   1792000 t=6.634827
        8000 L=   2048000 t=7.653030
        9000 L=   2304000 t=8.687737
       10000 L=   2560000 t=9.727445
       11000 L=   2816000 t=10.728646
       12000 L=   3072000 t=11.764352
       13000 L=   3328000 t=12.804560
       14000 L=   3584000 t=13.783257
       15000 L=   3840000 t=14.836966

with a scalar
        1000 L=    256000 t=0.003712
        2000 L=    512000 t=0.003200
        3000 L=    768000 t=0.003433
        4000 L=   1024000 t=0.003232
        5000 L=   1280000 t=0.003398
        6000 L=   1536000 t=0.003669
        7000 L=   1792000 t=0.004407
        8000 L=   2048000 t=0.002218
        9000 L=   2304000 t=0.004507
       10000 L=   2560000 t=0.002192
       11000 L=   2816000 t=0.005269
       12000 L=   3072000 t=0.002203
       13000 L=   3328000 t=0.006128
       14000 L=   3584000 t=0.002311
       15000 L=   3840000 t=0.002231