To copy a photo (Nef, 40Mo) from a catalog (17000 images) to another one (150 images) on the same hard disk, it takes more than 15 sec. If I make a copy-paste from one folder to another, only 2 sec.
Sure, the reference table must be updated, but I'm talking about one image. When there are some of them, its longer, of course (about 1 mn for 5 to 10 if I remember well).
In Contact Sheet preferences, Rescan on resume is not checked.
Thanks