No, that isn't necessary. If we were updating the DOM constantly then yes maybe 0 might make it crash. But mine doesn't update the DOM constantly. I've been running mine for 75685 combinations so far and it's still going smoothly.

For performance I also compare the PubKeyHash instead of the actual bitcoin address (won't make a hell of a lot of difference, but every little bit helps).

EDIT: Alright - thanks for the tip!