making gen 40 times faster at default parameters

before
python3 main.py -p shit3 > /dev/null  123.80s user 0.20s system 99% cpu 2:04.04 total
after
python3 main.py -p shit4 > /dev/null  3.36s user 0.54s system 99% cpu 3.900 total

$ du -hs *
102M	shit3
102M	shit4