before:

real    1m46.863s
user    45m43.306s
sys     4m54.403s

real    1m46.809s
user    45m51.093s
sys     4m51.973s

real    1m46.522s
user    45m48.324s
sys     4m51.805s

real    1m46.393s
user    45m46.248s
sys     4m53.201s

real    1m46.878s
user    45m43.960s
sys     4m52.311s

real    1m46.923s
user    45m47.961s
sys     4m52.736s

real    1m46.816s
user    45m49.505s
sys     4m51.729s

real    1m46.510s
user    45m48.532s
sys     4m52.656s

real    1m47.198s
user    45m48.881s
sys     4m51.929s

real    1m46.907s
user    45m47.346s
sys     4m54.122s

after:

real    1m47.858s
user    45m48.088s
sys     4m55.500s

real    1m46.748s
user    45m48.844s
sys     4m54.850s

real    1m47.003s
user    45m50.515s
sys     4m56.873s

real    1m46.827s
user    45m50.746s
sys     4m54.209s

real    1m46.564s
user    45m50.363s
sys     4m54.709s

real    1m46.494s
user    45m50.380s
sys     4m55.856s

real    1m47.029s
user    45m51.484s
sys     4m55.357s

real    1m47.093s
user    45m48.269s
sys     4m57.402s

real    1m46.937s
user    45m49.385s
sys     4m57.057s

real    1m46.771s
user    45m47.727s
sys     4m55.452s