YETI, 1 thread:
real    49m59.751s
user    49m54.531s
sys     0m2.372s

YETI, max 4 threads, but no continuous supply yet:
real    26m57.589s
user    54m0.303s
sys     0m5.656s

xussr, 1 thread:
real    1m26.747s
user    1m25.937s
sys     0m1.276s

xussr, max 4 threads:
real    2m4.170s
user    2m18.485s
sys     0m6.144s