Why Is It So Laggy?
Proper punctuation is always helpful.
I'd contact their customer support with whatever receipt number or transaction ID you have from the purchase though.
try turning your client's sleep timers all the way down.
They make it seem like it's lagging when it's really not.
However, if that's not what it was.. then you might have a problem. My kminer doesn't lag at all though, so that's my first guess.

