I have to agree with some of the comments here....
I have tried to learn my lesson about running Public Betas.
That being said, this Mojave PB 1 is by far the smoothest running beta I have ever encountered.
I mean, I have been running it for nearly a full week now with hardly a problem.
It's buttery smooth.
Some problems I encountered...
1. Software like TotalFinder, Mailbutler (and other assorted mail-plug-ins) do not work. No big deal for now
2. News crashes
3. Cannot copy and paste images in Safari. Have already sent a Feedback report to Apple.
But that is about it. Most every program I am running -- and I am literally running more than a dozen at startup -- are performing perfectly with no hiccups. I mean, even PARALLELS DESKTOP works right out of the gate which has NEVER been the case with any previous beta.
The iOS 12 PB is also running very well on my iPhone.
I am simply amazed at how well a beta can actually run to the point that I can recommend it as a base operating system as long as the user backs up his/her data.
Boot time? I can't give exact numbers but it doesn't seem any different or slower than High Sierra. There certainly isn't any lag from Apple logo to boot up, though a slight lag for all the programs to start up once logged in.
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Just had my first issue with Mojave beta this morning: SuperDuper (disc image backup) does not work at all, crashes right after you tell it to make a backup.
That's not especially good.
I made a backup of High Sierra using SuperDuper prior to installing Mojave.
Now, if I have to go back to High Sierra I can't depend on SuperDuper to do that for me.
Thankfully there are no issues with Mojave beta.