Cracking League with Account Reaper. How does it work?

[Vap3]

Confused on how to get this running as good as sentry. I make a 2 million combo, use the proxie grabber it has, test, delete all the ones that don't work, start it up and it gets to 2% and slows down to a trickle. Never speeds back up. Also when I hit stop it won't, keeps going then stops and I can never start it again.
Yes I am bran new please be gental with my booty when you school me in the comments.