Quote - Beta testers had 500+GB of content and had no problems with P8 reading them.

Yargh! And I thought I felt like a pig with ~50GB...

Quote - But with all folders closed, how long does it take to initally populate the trees? And can you give me an idea of these counts - order of magnitude? Like are there any over 500? Are there are  lot over 500?

It takes about 3 minutes to completely count all top level items. Figures, Poses and Props are all around 700 items, the rest are all between 100 and ~180.

After doing a little experimenting, completely collapsing all libraries to the the top before closing does seem to fix the wall of question marks issue.