I've had several random beach balls, but them it clears up on its own.Everything was going great for me until this morning when I couldn't even use my 2017 MacBook without freezing. I just purchased the computer on Monday, so I have reason to believe it was the public beta. (I hope anyway). I restored it back to Sierra. Anyone else have constant freezing beachball issues out of the blue with this beta?
I'm not sure I understand your post correctly. Just buying a new Mac does not get you the Beta, you have to intentionally sign up for it, get an invitation, then install it purposefully, it does not come pre-installed on any Macs from the store.