Please check the 4.0.5 here and give me your feedback.
The thing is: I experienced, that Page Builder in V 4.0.5 is specially extrem slow when working with predefined layouts. For example the "landscape" Home-Page.. after 2-3 Minutes of editing nearly nothing works anymore. If I try to import this in your mentioned installation, it says »invalid licence key«, so I could not test it. It's kind of strange, some things work smoothly, but with pre-made layouts it's no fun at all.
Do you already have a clue, why this could happen? I recognized other threads here in the forum where people have the same problem, some of them even have possible reasons (I read about reaching limits and font sizes... dont know..)
Thank you for your work, PB in my opinion has very high potential.. And I hope I can use it in production ASAP..