according to the manual the adjustment on the cutter(not computer) should adjust from
from the manual:
" Cutting speed
In speed setting mode, press
“+”or“-”to adjust cutting speed, high speed is suitable
for cutting big characters or image, while low speed is suitable for exquisite small
character or image. 10-shift speed is available for your choice:
10 → 20 → 30 → 40 → 50 → 60 → 70 → 80 "