After having installed V2 beta and 3 folders I had no particular problems: I could make thumbnails and averything was fine.
After that I uploaded my entire image collection (more than 5000 images categorized into several multilevel folders).
Now the situation is the following:
a) Loading the Gallery Home: http://www.marcobrivio.com/Portfolio/
takes much time, really too much
b) Accessing the admin panel is even worse. When there were a few folders I had no problems at all.
In my opinion (maybe I'm wrong), V2 calculates all the data related to the folder hierarchy (folder names, number of images loaded in each subfolder, etc...) and it takes definitely too much time to perform this task.
Regards,
Marco