roelofboek wrote:
Thank you for your quick respons. It is a sensible explanation. Surprising that those processes also run on other libraries than the system library, especially because they are located in different directories.
That is normal. When I create a new Photos Library for a special project and import several hundred photos, then switch again to my System photos Library, the new project library will have been scanned after two days or so, all faces detected, the objects recognised, the layout of the Days view completed. The background processes are working with all Photos Libraries they can access.